diff --git a/src/main/updater-linux-package-recovery-actions.test.ts b/src/main/updater-linux-package-recovery-actions.test.ts
index 4e9d50ecdf5..ff0b974bf7d 100644
--- a/src/main/updater-linux-package-recovery-actions.test.ts
+++ b/src/main/updater-linux-package-recovery-actions.test.ts
@@ -1,6 +1,7 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import type { UpdateStatus } from '../shared/update-status-types'
 import type * as UpdaterModule from './updater'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -95,6 +96,8 @@ const ARTIFACT = {
   sha512: 'LHlL7dKoqg98gS2nfQv878dK+UoktbAkm4M20/hoJ2Qr0Kqsa3MSL4VmWy/Lll/MYjQFkpvOxduQ/vswentozA=='
 }
 
+warmUpdaterModule()
+
 describe('linux package recovery actions', () => {
   afterEach(() => {
     vi.useRealTimers()
@@ -125,7 +128,7 @@ describe('linux package recovery actions', () => {
     updater: typeof UpdaterModule
   }> => {
     const send = vi.fn()
-    const updater = await import('./updater')
+    const updater = await loadUpdaterModule()
     updater.setupAutoUpdater({ webContents: { send } } as never, {
       getLastUpdateCheckAt: () => Date.now()
     })
diff --git a/src/main/updater-test-harness.leaked-timers.test.ts b/src/main/updater-test-harness.leaked-timers.test.ts
index d40ac5029a9..6857852c0e2 100644
--- a/src/main/updater-test-harness.leaked-timers.test.ts
+++ b/src/main/updater-test-harness.leaked-timers.test.ts
@@ -1,6 +1,7 @@
 import { setTimeout as sleep } from 'node:timers/promises'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import type { Mock } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const { autoUpdaterMock, fetchNewerReleaseTagsMock, moduleFactories, resetUpdaterMocks } =
   await vi.hoisted(async () => (await import('./updater-test-harness')).createUpdaterMocks())
@@ -22,6 +23,8 @@ vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBui
 const SILENT_SETTLE_DELAY_MS = 1_000
 const AUTO_UPDATE_CHECK_INTERVAL_MS = 24 * 60 * 60 * 1000
 
+warmUpdaterModule()
+
 describe('updater test harness real-timer tracking', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -79,7 +82,7 @@ describe('abandoned updater instance', () => {
     })
     leakedStatusSend = vi.fn()
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater({ webContents: { send: leakedStatusSend } } as never, {
       getLastUpdateCheckAt: () => Date.now() - 25 * 60 * 60 * 1000
diff --git a/src/main/updater-test-module-loader.test.ts b/src/main/updater-test-module-loader.test.ts
new file mode 100644
index 00000000000..0c894ede85b
--- /dev/null
+++ b/src/main/updater-test-module-loader.test.ts
@@ -0,0 +1,32 @@
+import { setTimeout as sleep } from 'node:timers/promises'
+import { afterAll, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule } from './updater-test-module-loader'
+
+// Why: this pair depends on running in file order — the first test starts an import it never awaits,
+// standing in for a test whose `await loadUpdaterModule()` outran `testTimeout`, and the second test
+// is the later test the continuation used to land in.
+describe('updater module loader', () => {
+  let outcome: Promise<string> = Promise.resolve('not started')
+
+  afterAll(() => {
+    vi.doUnmock('./updater')
+    vi.resetModules()
+  })
+
+  it('starts an import that outlives the test that asked for it', () => {
+    vi.resetModules()
+    vi.doMock('./updater', async () => {
+      await sleep(500)
+      return { setupAutoUpdater: () => {} }
+    })
+
+    outcome = loadUpdaterModule().then(
+      () => 'handed the module over',
+      (error: Error) => error.message
+    )
+  })
+
+  it('refuses to hand the module to a test that already ended', async () => {
+    await expect(outcome).resolves.toContain('resolved after that test ended')
+  })
+})
diff --git a/src/main/updater-test-module-loader.ts b/src/main/updater-test-module-loader.ts
new file mode 100644
index 00000000000..ee0a7355d40
--- /dev/null
+++ b/src/main/updater-test-module-loader.ts
@@ -0,0 +1,41 @@
+import { beforeAll, TestRunner } from 'vitest'
+import type * as UpdaterModule from './updater'
+
+/**
+ * Pays `updater.ts`'s transform cost once per file, against `hookTimeout` instead of `testTimeout`.
+ *
+ * Why: the module is ~2.4k lines and pulls in a wide graph, so a worker's first import of it costs
+ * ~1.4s idle but 45s+ on an oversubscribed machine — past the 30s `testTimeout`. `vi.resetModules()`
+ * re-evaluates the module without re-transforming it, so only a file's *first* import is exposed;
+ * warming it in a hook moves that one slow import onto the 60s hook budget and leaves every in-test
+ * import at re-evaluation cost (~25ms idle).
+ */
+export function warmUpdaterModule(): void {
+  beforeAll(async () => {
+    await import('./updater')
+  })
+}
+
+/**
+ * Imports `./updater`, refusing to hand the module to a test that has already ended.
+ *
+ * Why: vitest cannot cancel a timed-out test body. When the import outran `testTimeout` the
+ * continuation went on to call `setupAutoUpdater` during the *next* test, failing it with
+ * "expected 1 times, but got 2 times" — the exact signature of the abandoned-instance timer flake
+ * fixed in #17649/#17663, so the timeout read as that regression returning. Throwing here strands the
+ * continuation and leaves the timeout as the only reported failure.
+ */
+export async function loadUpdaterModule(): Promise<typeof UpdaterModule> {
+  const owner = TestRunner.getCurrentTest()
+  const module = await import('./updater')
+  if (owner !== undefined && TestRunner.getCurrentTest() !== owner) {
+    // Why: vitest has already settled the timed-out test's promise, so this throw is swallowed —
+    // warn separately or the reason the continuation was stranded reaches nobody.
+    process.emitWarning(
+      `updater import requested by "${owner.name}" resolved after that test ended. The test timed ` +
+        `out mid-import; fix that timeout, not the assertions.`
+    )
+    throw new Error(`updater import for "${owner.name}" resolved after that test ended`)
+  }
+  return module
+}
diff --git a/src/main/updater.build-channel-selection.test.ts b/src/main/updater.build-channel-selection.test.ts
index 9e036cc2b9e..32253a57b45 100644
--- a/src/main/updater.build-channel-selection.test.ts
+++ b/src/main/updater.build-channel-selection.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -27,6 +28,8 @@ vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBui
 /** Mirrors AUTO_UPDATE_CHECK_INTERVAL_MS in updater.ts. */
 const AUTO_UPDATE_CHECK_INTERVAL_MS = 24 * 60 * 60 * 1000
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -54,7 +57,7 @@ describe('updater', () => {
       const platformSpy = vi.spyOn(process, 'platform', 'get').mockReturnValue('linux')
       try {
         const send = vi.fn()
-        const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+        const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
         setupAutoUpdater({ webContents: { send } } as never, {
           getLastUpdateCheckAt: () => Date.now()
         })
@@ -83,7 +86,7 @@ describe('updater', () => {
     try {
       appMock.getVersion.mockReturnValue('1.4.160')
       const send = vi.fn()
-      const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+      const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -113,7 +116,7 @@ describe('updater', () => {
       try {
         appMock.getVersion.mockReturnValue('1.4.160-hourly.202607281400')
         const send = vi.fn()
-        const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+        const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
         setupAutoUpdater({ webContents: { send } } as never, {
           getLastUpdateCheckAt: () => Date.now()
         })
@@ -146,7 +149,7 @@ describe('updater', () => {
         return Promise.resolve(undefined)
       })
       const send = vi.fn()
-      const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+      const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -199,7 +202,7 @@ describe('updater', () => {
       chooseLocalBuildMock.mockRejectedValue(new Error('invalid local build'))
       const send = vi.fn()
       const { setupAutoUpdater, checkForUpdates, checkForUpdatesFromMenu } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -242,7 +245,7 @@ describe('updater', () => {
       })
       const send = vi.fn()
       const { setupAutoUpdater, checkForUpdates, checkForUpdatesFromMenu } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -281,7 +284,7 @@ describe('updater', () => {
       autoUpdaterMock.checkForUpdates.mockRejectedValueOnce(new Error('local feed failed'))
       const send = vi.fn()
       const { setupAutoUpdater, checkForUpdates, checkForUpdatesFromMenu } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -327,7 +330,7 @@ describe('updater', () => {
       autoUpdaterMock.downloadUpdate.mockRejectedValue(new Error('local download failed'))
       const send = vi.fn()
       const { setupAutoUpdater, checkForUpdatesFromMenu, downloadUpdate } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -382,7 +385,7 @@ describe('updater', () => {
       })
       const send = vi.fn()
       const { setupAutoUpdater, checkForUpdates, checkForUpdatesFromMenu, dismissAvailableUpdate } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -429,7 +432,7 @@ describe('updater', () => {
       autoUpdaterMock.downloadUpdate.mockResolvedValue(undefined)
       const send = vi.fn()
       const { setupAutoUpdater, checkForUpdatesFromMenu, dismissAvailableUpdate, downloadUpdate } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -461,7 +464,7 @@ describe('updater', () => {
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
     const mainWindow = { webContents: { send: vi.fn() } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     // Why: recent timestamp defers the startup check so we observe updater state before any RC-mode call, without racing.
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
@@ -490,7 +493,7 @@ describe('updater', () => {
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
     const mainWindow = { webContents: { send: vi.fn() } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
 
@@ -517,7 +520,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     const setupFeedUrlCalls = autoUpdaterMock.setFeedURL.mock.calls.length
@@ -548,7 +551,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
 
@@ -582,7 +585,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu({ includePrerelease: true })
@@ -604,7 +607,7 @@ describe('updater', () => {
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
     const mainWindow = { webContents: { send: vi.fn() } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     const initialFeedUrlCalls = autoUpdaterMock.setFeedURL.mock.calls.length
diff --git a/src/main/updater.check-failure.test.ts b/src/main/updater.check-failure.test.ts
index b0ca31a4556..62d228bf3a7 100644
--- a/src/main/updater.check-failure.test.ts
+++ b/src/main/updater.check-failure.test.ts
@@ -1,6 +1,7 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { installNetRequestFetchAdapter } from './updater-net-request.fixture'
 import { publishingIncident } from './updater-prerelease-feed-reproduction.fixture'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const { netFetchMock, netRequestMock } = vi.hoisted(() => ({
   netFetchMock: vi.fn(),
@@ -157,6 +158,8 @@ function makeBenignCheckFailure(message: string): void {
   })
 }
 
+warmUpdaterModule()
+
 describe('updater check failure handling', () => {
   beforeEach(() => {
     vi.resetModules()
@@ -188,7 +191,7 @@ describe('updater check failure handling', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -222,7 +225,7 @@ describe('updater check failure handling', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -264,7 +267,7 @@ describe('updater check failure handling', () => {
       const warnMock = vi.spyOn(console, 'warn').mockImplementation(() => undefined)
       const sendMock = vi.fn()
       const mainWindow = { webContents: { send: sendMock } }
-      const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+      const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
       setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
       checkForUpdatesFromMenu()
@@ -290,7 +293,7 @@ describe('updater check failure handling', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdates } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdates } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdates()
@@ -322,7 +325,7 @@ describe('updater check failure handling', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdates, getUpdateStatus } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdates, getUpdateStatus } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdates()
@@ -348,7 +351,7 @@ describe('updater check failure handling', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdates } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdates } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdates()
diff --git a/src/main/updater.check-preflight.test.ts b/src/main/updater.check-preflight.test.ts
index 2f4e23b4d19..6b2618aad05 100644
--- a/src/main/updater.check-preflight.test.ts
+++ b/src/main/updater.check-preflight.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -23,6 +24,8 @@ vi.mock('./updater-prerelease-feed', () => moduleFactories.updaterPrereleaseFeed
 vi.mock('./local-builds/local-build-switch', () => moduleFactories.localBuildSwitch())
 vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBuildFeedServer())
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -43,7 +46,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -98,7 +101,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -151,7 +154,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -208,7 +211,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -250,7 +253,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -293,7 +296,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -336,7 +339,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -368,7 +371,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -409,7 +412,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     appMock.getVersion.mockReturnValue('1.4.35')
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
@@ -466,7 +469,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
     checkForUpdatesFromMenu()
@@ -515,7 +518,7 @@ describe('updater', () => {
     autoUpdaterMock.checkForUpdates.mockImplementation(() => new Promise(() => {}))
     const mainWindow = { webContents: { send: vi.fn() } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
diff --git a/src/main/updater.check-settlement.test.ts b/src/main/updater.check-settlement.test.ts
index 61796de8e0f..6513dc40628 100644
--- a/src/main/updater.check-settlement.test.ts
+++ b/src/main/updater.check-settlement.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   autoUpdaterMock,
@@ -23,6 +24,8 @@ vi.mock('./updater-prerelease-feed', () => moduleFactories.updaterPrereleaseFeed
 vi.mock('./local-builds/local-build-switch', () => moduleFactories.localBuildSwitch())
 vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBuildFeedServer())
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -36,7 +39,7 @@ describe('updater', () => {
     })
     const send = vi.fn()
     const { setupAutoUpdater, checkForUpdatesFromMenu, dismissAvailableUpdate } =
-      await import('./updater')
+      await loadUpdaterModule()
     setupAutoUpdater({ webContents: { send } } as never, {
       getLastUpdateCheckAt: () => Date.now()
     })
@@ -68,7 +71,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -99,7 +102,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -142,7 +145,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -180,7 +183,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
 
@@ -217,7 +220,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
     checkForUpdatesFromMenu()
@@ -248,7 +251,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
 
@@ -281,7 +284,7 @@ describe('updater', () => {
     const setLastUpdateCheckAt = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -308,7 +311,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -337,7 +340,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
diff --git a/src/main/updater.headless-serve-install.test.ts b/src/main/updater.headless-serve-install.test.ts
index d3cd94f63f8..08e2f519861 100644
--- a/src/main/updater.headless-serve-install.test.ts
+++ b/src/main/updater.headless-serve-install.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -104,6 +105,8 @@ vi.mock('./serve-update-handoff', () => ({
   requestServeUpdateHandoff: requestServeUpdateHandoffMock
 }))
 
+warmUpdaterModule()
+
 describe('headless serve update install handoff', () => {
   beforeEach(() => {
     vi.resetModules()
@@ -152,7 +155,7 @@ describe('headless serve update install handoff', () => {
     })
     killAllPtyMock.mockImplementation(beginSessionCleanup)
 
-    const { checkForUpdatesFromMenu, quitAndInstall, setupAutoUpdater } = await import('./updater')
+    const { checkForUpdatesFromMenu, quitAndInstall, setupAutoUpdater } = await loadUpdaterModule()
     setupAutoUpdater(
       { webContents: { send } } as never,
       {
@@ -226,7 +229,7 @@ describe('headless serve update install handoff', () => {
       return Promise.resolve(null)
     })
 
-    const { checkForUpdatesFromMenu, downloadUpdate, setupAutoUpdater } = await import('./updater')
+    const { checkForUpdatesFromMenu, downloadUpdate, setupAutoUpdater } = await loadUpdaterModule()
     setupAutoUpdater({ webContents: { send } } as never, {
       getLastUpdateCheckAt: () => Date.now(),
       installMode: 'unsupported-headless-serve'
@@ -283,7 +286,7 @@ describe('headless serve update install handoff', () => {
     killAllPtyMock.mockImplementation(() => lifecycle.push('in-process-pty-cleanup'))
 
     const { checkForUpdatesFromMenu, downloadUpdate, quitAndInstall, setupAutoUpdater } =
-      await import('./updater')
+      await loadUpdaterModule()
     setupAutoUpdater({ webContents: { send } } as never, {
       getLastUpdateCheckAt: () => Date.now(),
       installMode: 'supervised-headless-serve',
@@ -330,7 +333,7 @@ describe('headless serve update install handoff', () => {
       return Promise.resolve(null)
     })
 
-    const { checkForUpdatesFromMenu, quitAndInstall, setupAutoUpdater } = await import('./updater')
+    const { checkForUpdatesFromMenu, quitAndInstall, setupAutoUpdater } = await loadUpdaterModule()
     setupAutoUpdater({ webContents: { send } } as never, {
       getLastUpdateCheckAt: () => Date.now(),
       installMode: 'supervised-headless-serve'
@@ -368,7 +371,7 @@ describe('headless serve update install handoff', () => {
         return Promise.resolve(null)
       })
 
-      const { checkForUpdatesFromMenu, setupAutoUpdater } = await import('./updater')
+      const { checkForUpdatesFromMenu, setupAutoUpdater } = await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now(),
         installMode: 'unsupported-headless-serve'
@@ -416,7 +419,7 @@ describe('headless serve update install handoff', () => {
         return Promise.resolve(null)
       })
 
-      const { checkForUpdatesFromMenu, setupAutoUpdater } = await import('./updater')
+      const { checkForUpdatesFromMenu, setupAutoUpdater } = await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now(),
         installMode: 'unsupported-headless-serve'
@@ -446,7 +449,7 @@ describe('headless serve update install handoff', () => {
       })
 
       const { checkForUpdatesFromMenu, quitAndInstall, setupAutoUpdater } =
-        await import('./updater')
+        await loadUpdaterModule()
       setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now(),
         installMode: 'unsupported-headless-serve'
@@ -481,7 +484,7 @@ describe('headless serve update install handoff', () => {
       downloadUpdate,
       getRemoteServerUpdateSupport,
       setupAutoUpdater
-    } = await import('./updater')
+    } = await loadUpdaterModule()
     setupAutoUpdater({ webContents: { send } } as never, {
       getLastUpdateCheckAt: () => Date.now(),
       installMode: 'interactive'
@@ -507,7 +510,7 @@ describe('headless serve update install handoff', () => {
 
   it('advertises remote update control only for safely restartable installs', async () => {
     const { checkForRemoteServerUpdate, getRemoteServerUpdateSupport, setupAutoUpdater } =
-      await import('./updater')
+      await loadUpdaterModule()
     setupAutoUpdater({ webContents: { send: vi.fn() } } as never, {
       getLastUpdateCheckAt: () => Date.now(),
       installMode: 'unsupported-headless-serve'
diff --git a/src/main/updater.install-failure-cause.test.ts b/src/main/updater.install-failure-cause.test.ts
index 5e61ac19554..6344a79d13b 100644
--- a/src/main/updater.install-failure-cause.test.ts
+++ b/src/main/updater.install-failure-cause.test.ts
@@ -2,6 +2,7 @@ import os from 'node:os'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import type * as TracerModule from './observability/tracer'
 import type * as UpdaterModule from './updater'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -145,7 +146,7 @@ async function reachDownloaded(): Promise<typeof UpdaterModule> {
   // same tracer instance updater.ts will import.
   tracer = await import('./observability/tracer')
   tracer.setActiveSink(capturingSink())
-  const updater = await import('./updater')
+  const updater = await loadUpdaterModule()
 
   updater.setupAutoUpdater(mainWindow as never)
   await vi.waitFor(() => {
@@ -159,6 +160,8 @@ async function reachDownloaded(): Promise<typeof UpdaterModule> {
   return updater
 }
 
+warmUpdaterModule()
+
 /**
  * On a `.deb` Linux host electron-updater's `install()` catches the failed elevation and
  * re-dispatches it through the 'error' event *synchronously* inside `quitAndInstall()`. Orca
diff --git a/src/main/updater.linux-root-package-install.test.ts b/src/main/updater.linux-root-package-install.test.ts
index 8139c5e2102..b52bf40f4c8 100644
--- a/src/main/updater.linux-root-package-install.test.ts
+++ b/src/main/updater.linux-root-package-install.test.ts
@@ -7,6 +7,7 @@ import type * as UpdaterModule from './updater'
 import type * as RecoveryModule from './linux-package-update-recovery'
 import type { UpdateStatus } from '../shared/update-status-types'
 import { PRE_COMMIT_INSTALL_FAILURE } from './updater-test-harness'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   browserWindowMock,
@@ -166,6 +167,8 @@ function probeRevalidation(): RevalidationProbe {
   }
 }
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -239,7 +242,7 @@ describe('updater', () => {
         return Promise.resolve(undefined)
       })
       const send = vi.fn()
-      const updater = await import('./updater')
+      const updater = await loadUpdaterModule()
       updater.setupAutoUpdater({ webContents: { send } } as never, {
         getLastUpdateCheckAt: () => Date.now()
       })
@@ -267,7 +270,7 @@ describe('updater', () => {
         vi.resetModules()
         autoUpdaterMock.autoInstallOnAppQuit = true
         getLinuxRootPackageTypeMock.mockReturnValue(packageType)
-        const { setupAutoUpdater } = await import('./updater')
+        const { setupAutoUpdater } = await loadUpdaterModule()
 
         setupAutoUpdater({ webContents: { send: vi.fn() } } as never, {
           getLastUpdateCheckAt: () => Date.now(),
@@ -280,7 +283,7 @@ describe('updater', () => {
 
     it('keeps interactive install-on-quit when no root-package marker is present', async () => {
       autoUpdaterMock.autoInstallOnAppQuit = false
-      const { setupAutoUpdater } = await import('./updater')
+      const { setupAutoUpdater } = await loadUpdaterModule()
 
       setupAutoUpdater({ webContents: { send: vi.fn() } } as never, {
         getLastUpdateCheckAt: () => Date.now(),
@@ -297,7 +300,7 @@ describe('updater', () => {
       ] as const) {
         vi.resetModules()
         autoUpdaterMock.autoInstallOnAppQuit = true
-        const { setupAutoUpdater } = await import('./updater')
+        const { setupAutoUpdater } = await loadUpdaterModule()
 
         setupAutoUpdater({ webContents: { send: vi.fn() } } as never, {
           getLastUpdateCheckAt: () => Date.now(),
diff --git a/src/main/updater.mac-install.test.ts b/src/main/updater.mac-install.test.ts
index f48754afd4f..e4fe26296a0 100644
--- a/src/main/updater.mac-install.test.ts
+++ b/src/main/updater.mac-install.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -117,6 +118,8 @@ vi.mock('./updater-nudge', () => ({
   shouldApplyNudge: vi.fn().mockReturnValue(false)
 }))
 
+warmUpdaterModule()
+
 describe('updater mac install handoff', () => {
   beforeEach(() => {
     vi.resetModules()
@@ -142,7 +145,7 @@ describe('updater mac install handoff', () => {
       const mainWindow = { webContents: { send: sendMock } }
 
       autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
-      const { setupAutoUpdater } = await import('./updater')
+      const { setupAutoUpdater } = await loadUpdaterModule()
 
       setupAutoUpdater(mainWindow as never)
       await vi.waitFor(() => {
@@ -194,7 +197,7 @@ describe('updater mac install handoff', () => {
       const mainWindow = { webContents: { send: vi.fn() } }
 
       autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
-      const { setupAutoUpdater, quitAndInstall } = await import('./updater')
+      const { setupAutoUpdater, quitAndInstall } = await loadUpdaterModule()
 
       setupAutoUpdater(mainWindow as never, { onBeforeQuit })
       await vi.waitFor(() => {
@@ -276,7 +279,7 @@ describe('updater mac install handoff', () => {
       const mainWindow = { webContents: { send: sendMock } }
 
       autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
-      const { setupAutoUpdater } = await import('./updater')
+      const { setupAutoUpdater } = await loadUpdaterModule()
 
       setupAutoUpdater(mainWindow as never)
       await vi.waitFor(() => {
diff --git a/src/main/updater.nudge-campaign.test.ts b/src/main/updater.nudge-campaign.test.ts
index 3ce7a810e5d..eb3faf1eaa2 100644
--- a/src/main/updater.nudge-campaign.test.ts
+++ b/src/main/updater.nudge-campaign.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -24,6 +25,8 @@ vi.mock('./updater-prerelease-feed', () => moduleFactories.updaterPrereleaseFeed
 vi.mock('./local-builds/local-build-switch', () => moduleFactories.localBuildSwitch())
 vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBuildFeedServer())
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -40,7 +43,7 @@ describe('updater', () => {
       return Promise.resolve(undefined)
     })
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     // Why: recent timestamp defers the startup check so the nudge check runs without hitting the 'checking' guard.
     setupAutoUpdater(mainWindow as never, {
@@ -93,7 +96,7 @@ describe('updater', () => {
       return Promise.resolve(undefined)
     })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -127,7 +130,7 @@ describe('updater', () => {
       return new Promise(() => {})
     })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -152,7 +155,7 @@ describe('updater', () => {
     shouldApplyNudgeMock.mockReturnValue(true)
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
 
@@ -188,7 +191,7 @@ describe('updater', () => {
       return Promise.resolve(undefined)
     })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -226,7 +229,7 @@ describe('updater', () => {
     fetchNewerReleaseTagsMock.mockResolvedValue({ tags: [], state: 'no-newer' })
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -262,7 +265,7 @@ describe('updater', () => {
       return Promise.resolve(undefined)
     })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -300,7 +303,7 @@ describe('updater', () => {
       return Promise.reject(missingManifest)
     })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -330,7 +333,7 @@ describe('updater', () => {
       return Promise.resolve(undefined)
     })
 
-    const { setupAutoUpdater, dismissNudge } = await import('./updater')
+    const { setupAutoUpdater, dismissNudge } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
diff --git a/src/main/updater.prerelease-fallback.test.ts b/src/main/updater.prerelease-fallback.test.ts
index 3cdf6c0300d..49ed4ca1bb6 100644
--- a/src/main/updater.prerelease-fallback.test.ts
+++ b/src/main/updater.prerelease-fallback.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const { appMock, autoUpdaterMock, fetchNewerReleaseTagsMock, moduleFactories, resetUpdaterMocks } =
   await vi.hoisted(async () => (await import('./updater-test-harness')).createUpdaterMocks())
@@ -17,6 +18,8 @@ vi.mock('./updater-prerelease-feed', () => moduleFactories.updaterPrereleaseFeed
 vi.mock('./local-builds/local-build-switch', () => moduleFactories.localBuildSwitch())
 vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBuildFeedServer())
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -45,7 +48,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -89,7 +92,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -133,7 +136,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
 
@@ -181,7 +184,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => lastUpdateCheckAt })
     checkForUpdatesFromMenu()
@@ -237,7 +240,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -283,7 +286,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const setLastUpdateCheckAt = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -331,7 +334,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -378,7 +381,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => null })
 
@@ -432,7 +435,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -488,7 +491,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const setLastUpdateCheckAt = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -542,7 +545,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const setLastUpdateCheckAt = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -597,7 +600,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const setLastUpdateCheckAt = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -643,7 +646,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -669,7 +672,7 @@ describe('updater', () => {
     fetchNewerReleaseTagsMock.mockResolvedValue(['v1.3.18'])
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     const mainWindow = { webContents: { send: vi.fn() } }
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
@@ -694,7 +697,7 @@ describe('updater', () => {
     fetchNewerReleaseTagsMock.mockResolvedValue(['v1.3.18-rc.1'])
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     const mainWindow = { webContents: { send: vi.fn() } }
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
diff --git a/src/main/updater.publishing-window-feed.test.ts b/src/main/updater.publishing-window-feed.test.ts
index 37f004aedf9..144eae55845 100644
--- a/src/main/updater.publishing-window-feed.test.ts
+++ b/src/main/updater.publishing-window-feed.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -24,6 +25,8 @@ vi.mock('./updater-prerelease-feed', () => moduleFactories.updaterPrereleaseFeed
 vi.mock('./local-builds/local-build-switch', () => moduleFactories.localBuildSwitch())
 vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBuildFeedServer())
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -35,7 +38,7 @@ describe('updater', () => {
     fetchNewerReleaseTagsMock.mockResolvedValue(['v1.3.17-rc.2'])
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     const mainWindow = { webContents: { send: vi.fn() } }
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
@@ -67,7 +70,7 @@ describe('updater', () => {
     fetchNewerReleaseTagsMock.mockResolvedValue(['v1.3.19'])
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     const mainWindow = { webContents: { send: vi.fn() } }
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
@@ -89,7 +92,7 @@ describe('updater', () => {
     fetchNewerReleaseTagsMock.mockResolvedValue([])
     autoUpdaterMock.checkForUpdates.mockResolvedValue(undefined)
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     const mainWindow = { webContents: { send: vi.fn() } }
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
@@ -115,7 +118,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     const feedCallsBeforeCheck = autoUpdaterMock.setFeedURL.mock.calls.length
@@ -146,7 +149,7 @@ describe('updater', () => {
     })
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -182,7 +185,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     const feedCallsBeforeCheck = autoUpdaterMock.setFeedURL.mock.calls.length
@@ -234,7 +237,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
 
@@ -273,7 +276,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -328,7 +331,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -371,7 +374,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -444,7 +447,7 @@ describe('updater', () => {
       const sendMock = vi.fn()
       const mainWindow = { webContents: { send: sendMock } }
 
-      const { setupAutoUpdater } = await import('./updater')
+      const { setupAutoUpdater } = await loadUpdaterModule()
 
       setupAutoUpdater(mainWindow as never, {
         getLastUpdateCheckAt: () => Date.now(),
@@ -513,7 +516,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
@@ -580,7 +583,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, dismissNudge } = await import('./updater')
+    const { setupAutoUpdater, dismissNudge } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now(),
diff --git a/src/main/updater.quit-and-install.test.ts b/src/main/updater.quit-and-install.test.ts
index 945538b3895..0d381ea473a 100644
--- a/src/main/updater.quit-and-install.test.ts
+++ b/src/main/updater.quit-and-install.test.ts
@@ -1,5 +1,6 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { PRE_COMMIT_INSTALL_FAILURE } from './updater-test-harness'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   nativeUpdaterMock,
@@ -41,6 +42,8 @@ vi.mock('./startup/hydrate-shell-path', () => ({
   }
 }))
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -64,7 +67,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu, downloadUpdate } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu, downloadUpdate } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -102,7 +105,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu, downloadUpdate } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu, downloadUpdate } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -143,7 +146,7 @@ describe('updater', () => {
     })
 
     const mainWindow = { webContents: { send: vi.fn() } }
-    const { setupAutoUpdater, quitAndInstall } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
     quitAndInstall()
@@ -166,7 +169,7 @@ describe('updater', () => {
 
     const onBeforeQuit = vi.fn()
     const mainWindow = { webContents: { send: vi.fn() } }
-    const { setupAutoUpdater, quitAndInstall } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { onBeforeQuit })
     quitAndInstall()
@@ -184,7 +187,7 @@ describe('updater', () => {
     vi.useFakeTimers()
 
     const mainWindow = { webContents: { send: vi.fn() } }
-    const { setupAutoUpdater, quitAndInstall } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
     quitAndInstall()
@@ -206,7 +209,7 @@ describe('updater', () => {
         })
     )
     const mainWindow = { webContents: { send: vi.fn() } }
-    const { setupAutoUpdater, quitAndInstall } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { onBeforeQuit })
     quitAndInstall()
@@ -237,7 +240,7 @@ describe('updater', () => {
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, quitAndInstall, isQuittingForUpdate } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall, isQuittingForUpdate } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
     quitAndInstall()
@@ -273,7 +276,7 @@ describe('updater', () => {
     })
 
     const { setupAutoUpdater, checkForUpdatesFromMenu, quitAndInstall, isQuittingForUpdate } =
-      await import('./updater')
+      await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -332,7 +335,7 @@ describe('updater', () => {
       return Promise.resolve(undefined)
     })
 
-    const { setupAutoUpdater, checkForUpdatesFromMenu, quitAndInstall } = await import('./updater')
+    const { setupAutoUpdater, checkForUpdatesFromMenu, quitAndInstall } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, { getLastUpdateCheckAt: () => Date.now() })
     checkForUpdatesFromMenu()
@@ -377,7 +380,7 @@ describe('updater', () => {
     })
 
     const mainWindow = { webContents: { send: vi.fn() } }
-    const { setupAutoUpdater, quitAndInstall, isQuittingForUpdate } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall, isQuittingForUpdate } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
     quitAndInstall()
@@ -402,7 +405,7 @@ describe('updater', () => {
     )
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
-    const { setupAutoUpdater, quitAndInstall, isQuittingForUpdate } = await import('./updater')
+    const { setupAutoUpdater, quitAndInstall, isQuittingForUpdate } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       onBeforeQuit,
diff --git a/src/main/updater.startup-scheduling.test.ts b/src/main/updater.startup-scheduling.test.ts
index 06a1ea041be..46190de47da 100644
--- a/src/main/updater.startup-scheduling.test.ts
+++ b/src/main/updater.startup-scheduling.test.ts
@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { loadUpdaterModule, warmUpdaterModule } from './updater-test-module-loader'
 
 const {
   appMock,
@@ -25,6 +26,8 @@ vi.mock('./updater-prerelease-feed', () => moduleFactories.updaterPrereleaseFeed
 vi.mock('./local-builds/local-build-switch', () => moduleFactories.localBuildSwitch())
 vi.mock('./local-builds/local-build-feed-server', () => moduleFactories.localBuildFeedServer())
 
+warmUpdaterModule()
+
 describe('updater', () => {
   beforeEach(() => {
     resetUpdaterMocks()
@@ -34,7 +37,7 @@ describe('updater', () => {
     isMock.dev = true
     const mainWindow = { webContents: { send: vi.fn() } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
 
@@ -49,7 +52,7 @@ describe('updater', () => {
     const mainWindow = { webContents: { send: vi.fn() } }
     const setLastUpdateCheckAt = vi.fn()
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now() - 25 * 60 * 60 * 1000,
@@ -67,7 +70,7 @@ describe('updater', () => {
     fetchNudgeMock.mockResolvedValue({ id: 'campaign-1', minVersion: '1.0.0' })
     shouldApplyNudgeMock.mockReturnValue(true)
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never)
 
@@ -89,7 +92,7 @@ describe('updater', () => {
     const mainWindow = { webContents: { send: vi.fn() } }
     const setLastUpdateCheckAt = vi.fn()
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => Date.now() - 23 * 60 * 60 * 1000,
@@ -114,7 +117,7 @@ describe('updater', () => {
 
     autoUpdaterMock.checkForUpdates.mockImplementation(() => new Promise(() => {}))
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => lastUpdateCheckAt
@@ -143,7 +146,7 @@ describe('updater', () => {
       return Promise.reject(new Error('net::ERR_FAILED'))
     })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => lastUpdateCheckAt,
@@ -178,7 +181,7 @@ describe('updater', () => {
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     setupAutoUpdater(mainWindow as never, {
       getLastUpdateCheckAt: () => null,
@@ -214,7 +217,7 @@ describe('updater', () => {
     const setLastUpdateCheckAt = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     // Why: a startup check also arms its own 24h timer, which would fire at the same boundary as the
     // reschedule under test; entering 23h in makes the startup timer fire the check itself, so only
@@ -255,7 +258,7 @@ describe('updater', () => {
   it('does not disable Windows Authenticode verification on win32', async () => {
     vi.stubGlobal('process', { ...process, platform: 'win32' })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }
@@ -268,7 +271,7 @@ describe('updater', () => {
   it('does not override verifyUpdateCodeSignature on non-Windows platforms', async () => {
     vi.stubGlobal('process', { ...process, platform: 'darwin' })
 
-    const { setupAutoUpdater } = await import('./updater')
+    const { setupAutoUpdater } = await loadUpdaterModule()
 
     const sendMock = vi.fn()
     const mainWindow = { webContents: { send: sendMock } }