diff --git a/web/src/lib/api/hooks/app/analytics/useAccountStatuses.test.tsx b/web/src/lib/api/hooks/app/analytics/useAccountStatuses.test.tsx
new file mode 100644
index 000000000..5850c3518
--- /dev/null
+++ b/web/src/lib/api/hooks/app/analytics/useAccountStatuses.test.tsx
@@ -0,0 +1,104 @@
+import type { PropsWithChildren } from "react";
+import { act, renderHook, waitFor } from "@testing-library/react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import useAccountStatuses from "@/lib/api/hooks/app/analytics/useAccountStatuses";
+import getAccountStatuses from "@/lib/api/client/app/analytics/getAccountStatuses";
+import type AccountStatus from "@/lib/api/models/app/analytics/AccountStatus";
+
+vi.mock("@/lib/api/client/app/analytics/getAccountStatuses", () => ({ default: vi.fn() }));
+
+function harness() {
+    const client = new QueryClient({ defaultOptions: { queries: { retry: false, gcTime: Infinity, staleTime: Infinity } } });
+    const wrapper = ({ children }: PropsWithChildren) => <QueryClientProvider client={client}>{children}</QueryClientProvider>;
+    return { client, wrapper };
+}
+
+function status(id: string): AccountStatus {
+    return { id } as AccountStatus;
+}
+
+beforeEach(() => {
+    vi.clearAllMocks();
+    vi.mocked(getAccountStatuses).mockImplementation(async (ids) => ids.map(status));
+});
+
+describe("account status aggregation", () => {
+    it("keeps sorted, bounded keys without mutating the input or refetching on reorder", async () => {
+        const { client, wrapper } = harness();
+        const ids = Array.from({ length: 205 }, (_, i) => String(204 - i).padStart(3, "0"));
+        const original = [...ids];
+        const { result, rerender, unmount } = renderHook(({ ids }) => useAccountStatuses(ids), { wrapper, initialProps: { ids } });
+        await waitFor(() => expect(result.current.data).toHaveLength(205));
+        expect(ids).toEqual(original);
+        expect(vi.mocked(getAccountStatuses).mock.calls.map(([chunk]) => chunk.length)).toEqual([100, 100, 5]);
+        expect(result.current.data.map((s) => s.id)).toEqual([...ids].sort());
+        expect(getAccountStatuses).toHaveBeenCalledTimes(3);
+        const first = result.current;
+        rerender({ ids: [...ids].reverse() });
+        expect(result.current).toBe(first);
+        expect(getAccountStatuses).toHaveBeenCalledTimes(3);
+        expect(client.getQueryCache().getAll().every((q) => q.queryKey.slice(0, 3).join("/") === "analytics/accounts/list")).toBe(true);
+        unmount(); client.clear();
+    });
+
+    it("skips per-row aggregation on unchanged renders and recomputes for realtime data", async () => {
+        const { client, wrapper } = harness();
+        const ids = Array.from({ length: 200 }, (_, i) => String(i));
+        const { result, rerender, unmount } = renderHook(() => useAccountStatuses(ids), { wrapper });
+        await waitFor(() => expect(result.current.data).toHaveLength(200));
+        const first = result.current;
+        const query = client.getQueryCache().getAll()[0];
+        // Every aggregation maps each chunk into observations.
+        const observationMaps = client.getQueryCache().getAll().map((q) => vi.spyOn(q.state.data as AccountStatus[], "map"));
+        const start = performance.now();
+        for (let i = 0; i < 200; i++) rerender();
+        console.info(JSON.stringify({ fixture: "200 statuses; two 100-row chunks; 200 unchanged renders", observationMaps: observationMaps.reduce((sum, spy) => sum + spy.mock.calls.length, 0), elapsedMs: performance.now() - start }));
+        expect(result.current).toBe(first);
+        for (const spy of observationMaps) {
+            expect(spy).not.toHaveBeenCalled();
+            spy.mockRestore();
+        }
+        act(() => client.setQueryData(query.queryKey, [status("updated")]));
+        await waitFor(() => expect(result.current.data[0].id).toBe("updated"));
+        expect(result.current.observations[0]).toMatchObject({ status: status("updated"), current: true });
+        unmount(); client.clear();
+    });
+
+    it("preserves enabled gating, empty selection and source-revision freshness", async () => {
+        const { client, wrapper } = harness();
+        const { result, rerender, unmount } = renderHook(
+            ({ ids, enabled, revision }) => useAccountStatuses(ids, { enabled, sourceRevision: revision }),
+            { wrapper, initialProps: { ids: [] as string[], enabled: false, revision: 0 } },
+        );
+        expect(result.current.data).toEqual([]);
+        expect(getAccountStatuses).not.toHaveBeenCalled();
+        rerender({ ids: ["a"], enabled: false, revision: 0 });
+        expect(getAccountStatuses).not.toHaveBeenCalled();
+        rerender({ ids: ["a"], enabled: true, revision: 0 });
+        await waitFor(() => expect(result.current.data).toEqual([status("a")]));
+        rerender({ ids: ["b"], enabled: true, revision: 1 });
+        await waitFor(() => expect(result.current.data).toEqual([status("b")]));
+        expect(getAccountStatuses).toHaveBeenCalledTimes(2);
+        expect(client.getQueryCache().getAll().some((q) => q.queryKey[4] === 1)).toBe(true);
+        unmount(); client.clear();
+    });
+
+    it("marks retained observations non-current during refetch and on refetch failure", async () => {
+        const { client, wrapper } = harness();
+        const ids = ["a"];
+        const { result, unmount } = renderHook(() => useAccountStatuses(ids), { wrapper });
+        await waitFor(() => expect(result.current.observations[0]?.current).toBe(true));
+        const observedAt = result.current.observations[0].observedAt;
+        let reject!: (reason: Error) => void;
+        vi.mocked(getAccountStatuses).mockImplementationOnce(() => new Promise((_resolve, rej) => { reject = rej; }));
+        act(() => { void client.invalidateQueries({ queryKey: ["analytics", "accounts"] }); });
+        await waitFor(() => expect(result.current.isFetching).toBe(true));
+        expect(result.current.observations[0]).toMatchObject({ observedAt, current: false });
+        act(() => reject(new Error("refetch failed")));
+        await waitFor(() => expect(result.current.isError).toBe(true));
+        expect(result.current.data).toEqual([status("a")]);
+        expect(result.current.observations[0]).toMatchObject({ observedAt, current: false });
+        unmount(); client.clear();
+    });
+});
diff --git a/web/src/lib/api/hooks/app/analytics/useAccountStatuses.ts b/web/src/lib/api/hooks/app/analytics/useAccountStatuses.ts
index f6355053b..e135688b5 100644
--- a/web/src/lib/api/hooks/app/analytics/useAccountStatuses.ts
+++ b/web/src/lib/api/hooks/app/analytics/useAccountStatuses.ts
@@ -1,4 +1,5 @@
-import { useQueries } from "@tanstack/react-query";
+import { useMemo } from "react";
+import { useQueries, type UseQueryResult } from "@tanstack/react-query";
 import getAccountStatuses from "@/lib/api/client/app/analytics/getAccountStatuses";
 import type AccountStatus from "@/lib/api/models/app/analytics/AccountStatus";
 
@@ -22,22 +23,27 @@ export default function useAccountStatuses(emailIds: string[], options?: { enabl
     // Sort so a chunk's id set (and its query key) is stable regardless of the
     // order the mailbox list arrived in; adding a mailbox only refetches the
     // chunk it lands in.
-    const chunks = chunk([...emailIds].sort());
-
-    return useQueries({
-        queries: chunks.map((ids) => ({
-            queryKey: ["analytics", "accounts", "list", ids, options?.sourceRevision ?? 0],
+    const enabled = options?.enabled ?? true;
+    const sourceRevision = options?.sourceRevision ?? 0;
+    const queries = useMemo(
+        () => chunk([...emailIds].sort()).map((ids) => ({
+            queryKey: ["analytics", "accounts", "list", ids, sourceRevision],
             queryFn: ({ signal }: { signal: AbortSignal }) => getAccountStatuses(ids, signal),
-            enabled: ids.length > 0 && (options?.enabled ?? true),
+            enabled: ids.length > 0 && enabled,
         })),
-        // react-query memoizes this by result reference, so the merged array is
-        // stable across renders until a chunk actually updates.
-        combine: (results) => ({
-            data: results.flatMap((r) => (r.data ?? []) as AccountStatus[]),
-            observations: results.flatMap((r) => (r.data ?? []).map((status) => ({ status, observedAt: r.dataUpdatedAt, current: r.isSuccess && !r.isFetching }))),
-            isLoading: results.some((r) => r.isLoading),
-            isFetching: results.some((r) => r.isFetching),
-            isError: results.some((r) => r.isError),
-        }),
-    });
+        [emailIds, enabled, sourceRevision],
+    );
+
+    return useQueries({ queries, combine: combineAccountStatuses });
+}
+
+// TanStack reuses the aggregation only while both results and this callback are stable.
+function combineAccountStatuses(results: UseQueryResult<AccountStatus[], Error>[]) {
+    return {
+        data: results.flatMap((r) => r.data ?? []),
+        observations: results.flatMap((r) => (r.data ?? []).map((status) => ({ status, observedAt: r.dataUpdatedAt, current: r.isSuccess && !r.isFetching }))),
+        isLoading: results.some((r) => r.isLoading),
+        isFetching: results.some((r) => r.isFetching),
+        isError: results.some((r) => r.isError),
+    };
 }
diff --git a/web/src/lib/api/hooks/app/campaigns/useCampaigns.ts b/web/src/lib/api/hooks/app/campaigns/useCampaigns.ts
index 289aca6a5..cc2c6ab7a 100644
--- a/web/src/lib/api/hooks/app/campaigns/useCampaigns.ts
+++ b/web/src/lib/api/hooks/app/campaigns/useCampaigns.ts
@@ -1,3 +1,4 @@
+import { useMemo } from "react";
 import { infiniteQueryOptions, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import getCampaigns from "@/lib/api/client/app/campaigns/getCampaigns";
 import useAllPages from "@/lib/api/hooks/useAllPages";
@@ -53,10 +54,12 @@ export default function useCampaigns({ query, folder, limit = CAMPAIGNS_PAGE_LIM
     // Defensive: backend may return `data: null` on empty result sets if
     // the underlying slice was nil. Coerce + drop nulls so consumers can
     // safely read fields without optional-chaining every access.
-    const campaigns =
-        queryResult.data?.pages
+    const campaigns = useMemo(
+        () => queryResult.data?.pages
             .flatMap((p) => p.data ?? [])
-            .filter((c): c is NonNullable<typeof c> => c != null) ?? [];
+            .filter((c): c is NonNullable<typeof c> => c != null) ?? [],
+        [queryResult.data],
+    );
 
     return {
         ...queryResult,
diff --git a/web/src/lib/api/hooks/app/contacts/useSearchContacts.ts b/web/src/lib/api/hooks/app/contacts/useSearchContacts.ts
index 150a0e235..6456fe039 100644
--- a/web/src/lib/api/hooks/app/contacts/useSearchContacts.ts
+++ b/web/src/lib/api/hooks/app/contacts/useSearchContacts.ts
@@ -1,3 +1,4 @@
+import { useMemo } from "react";
 import { infiniteQueryOptions, keepPreviousData, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import { DEFAULT_PAGINATION_LIMIT } from "@/lib/information";
 import type SearchContacts from "@/lib/api/models/app/contacts/SearchContacts";
@@ -44,9 +45,12 @@ export default function useSearchContacts({ options, limit = DEFAULT_PAGINATION_
     // Defensive: backend may serialize a nil slice as JSON null on empty
     // result sets. `flatMap((p) => p.data)` over null would yield [null].
     // Coerce + drop nulls so downstream UIs can safely read fields.
-    const contacts = queryResult.data?.pages
-        .flatMap((p) => p.data ?? [])
-        .filter((c): c is NonNullable<typeof c> => c != null);
+    const contacts = useMemo(
+        () => queryResult.data?.pages
+            .flatMap((p) => p.data ?? [])
+            .filter((c): c is NonNullable<typeof c> => c != null),
+        [queryResult.data],
+    );
 
     return {
         ...queryResult,
diff --git a/web/src/lib/api/hooks/app/crm/deals/useSearchDeals.ts b/web/src/lib/api/hooks/app/crm/deals/useSearchDeals.ts
index e22ebe8cc..c635339f3 100644
--- a/web/src/lib/api/hooks/app/crm/deals/useSearchDeals.ts
+++ b/web/src/lib/api/hooks/app/crm/deals/useSearchDeals.ts
@@ -1,3 +1,4 @@
+import { useMemo } from "react";
 import { infiniteQueryOptions, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import type SearchDeals from "@/lib/api/models/app/crm/SearchDeals";
 import type DealsSearchResult from "@/lib/api/models/app/crm/DealsSearchResult";
@@ -35,9 +36,12 @@ export default function useSearchDeals({ filters, limit = 50, enabled = true }:
         enabled,
     });
 
-    const deals = queryResult.data?.pages
-        .flatMap((p) => p.data ?? [])
-        .filter((d): d is NonNullable<typeof d> => d != null);
+    const deals = useMemo(
+        () => queryResult.data?.pages
+            .flatMap((p) => p.data ?? [])
+            .filter((d): d is NonNullable<typeof d> => d != null),
+        [queryResult.data],
+    );
 
     const total = queryResult.data?.pages[0]?.pagination.total ?? 0;
 
diff --git a/web/src/lib/api/hooks/app/crm/tasks/useSearchTasks.ts b/web/src/lib/api/hooks/app/crm/tasks/useSearchTasks.ts
index 90031705d..28f80ec7d 100644
--- a/web/src/lib/api/hooks/app/crm/tasks/useSearchTasks.ts
+++ b/web/src/lib/api/hooks/app/crm/tasks/useSearchTasks.ts
@@ -1,3 +1,4 @@
+import { useMemo } from "react";
 import { infiniteQueryOptions, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import type SearchTasks from "@/lib/api/models/app/crm/SearchTasks";
 import type TasksSearchResult from "@/lib/api/models/app/crm/TasksSearchResult";
@@ -36,9 +37,12 @@ export default function useSearchTasks({ filters, limit = 50, enabled = true }:
         enabled,
     });
 
-    const tasks = queryResult.data?.pages
-        .flatMap((p) => p.data ?? [])
-        .filter((t): t is NonNullable<typeof t> => t != null);
+    const tasks = useMemo(
+        () => queryResult.data?.pages
+            .flatMap((p) => p.data ?? [])
+            .filter((t): t is NonNullable<typeof t> => t != null),
+        [queryResult.data],
+    );
 
     const total = queryResult.data?.pages[0]?.pagination.total ?? 0;
 
diff --git a/web/src/lib/api/hooks/app/emails/useEmails.test.tsx b/web/src/lib/api/hooks/app/emails/useEmails.test.tsx
new file mode 100644
index 000000000..cacc424c5
--- /dev/null
+++ b/web/src/lib/api/hooks/app/emails/useEmails.test.tsx
@@ -0,0 +1,79 @@
+import type { PropsWithChildren } from "react";
+import { act, renderHook, waitFor } from "@testing-library/react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import useEmails from "./useEmails";
+import getEmails from "@/lib/api/client/app/emails/getEmails";
+import type Inbox from "@/lib/api/models/app/emails/Inbox";
+import type GetEmails from "@/lib/api/models/app/emails/GetEmails";
+
+vi.mock("@/lib/api/client/app/emails/getEmails", () => ({ default: vi.fn() }));
+
+function harness() {
+    const client = new QueryClient({ defaultOptions: { queries: { retry: false, gcTime: Infinity } } });
+    const wrapper = ({ children }: PropsWithChildren) => <QueryClientProvider client={client}>{children}</QueryClientProvider>;
+    return { client, wrapper };
+}
+
+function page(id: string, cursor: string | null): GetEmails {
+    return {
+        data: [{ id }] as Inbox[],
+        pagination: { has_more: cursor !== null, next_cursor: cursor, total: 2 },
+    };
+}
+
+beforeEach(() => vi.resetAllMocks());
+
+describe("mailbox query lifecycle", () => {
+    it("still completes all pages and refreshes both pages on realtime invalidation", async () => {
+        const { client, wrapper } = harness();
+        let revision = 0;
+        vi.mocked(getEmails).mockImplementation(async (_query, cursor) => cursor ? page(`b-${revision}`, null) : page(`a-${revision}`, "next"));
+        const { result, rerender, unmount } = renderHook(() => useEmails({ query: "", tag: "" }), { wrapper });
+        await waitFor(() => expect(result.current.emails.map((r) => r.id)).toEqual(["a-0", "b-0"]));
+        expect(getEmails).toHaveBeenCalledTimes(2);
+        expect(getEmails).toHaveBeenNthCalledWith(1, "", null, "", 200);
+        expect(getEmails).toHaveBeenNthCalledWith(2, "", "next", "", 200);
+        const first = result.current.emails;
+        rerender();
+        expect(result.current.emails).toBe(first);
+        expect(getEmails).toHaveBeenCalledTimes(2);
+        revision++;
+        act(() => { void client.invalidateQueries({ queryKey: ["emails"] }); });
+        await waitFor(() => expect(result.current.emails.map((r) => r.id)).toEqual(["a-1", "b-1"]));
+        expect(getEmails).toHaveBeenCalledTimes(4);
+        expect(result.current.hasNextPage).toBe(false);
+        unmount(); client.clear();
+    });
+
+    it("respects enabled gating and clears old rows when query or tag changes", async () => {
+        const { client, wrapper } = harness();
+        vi.mocked(getEmails).mockImplementation(async (query, _cursor, tag) => page(`${query}:${tag}`, null));
+        const { result, rerender, unmount } = renderHook(
+            (props) => useEmails(props),
+            { wrapper, initialProps: { query: "first", tag: "a", enabled: false } },
+        );
+        expect(getEmails).not.toHaveBeenCalled();
+        expect(result.current.emails).toEqual([]);
+        rerender({ query: "first", tag: "a", enabled: true });
+        await waitFor(() => expect(result.current.emails[0]?.id).toBe("first:a"));
+        rerender({ query: "second", tag: "b", enabled: true });
+        expect(result.current.emails).toEqual([]);
+        await waitFor(() => expect(result.current.emails[0]?.id).toBe("second:b"));
+        expect(getEmails).toHaveBeenCalledTimes(2);
+        unmount(); client.clear();
+    });
+
+    it("keeps loaded rows and surfaces a next-page failure without looping requests", async () => {
+        const { client, wrapper } = harness();
+        const error = new Error("next page failed");
+        vi.mocked(getEmails).mockResolvedValueOnce(page("a", "next")).mockRejectedValue(error);
+        const { result, rerender, unmount } = renderHook(() => useEmails({ query: "", tag: "" }), { wrapper });
+        await waitFor(() => expect(result.current.isFetchNextPageError).toBe(true));
+        expect(result.current.error).toBe(error);
+        expect(result.current.emails.map((r) => r.id)).toEqual(["a"]);
+        for (let i = 0; i < 10; i++) rerender();
+        expect(getEmails).toHaveBeenCalledTimes(2);
+        unmount(); client.clear();
+    });
+});
diff --git a/web/src/lib/api/hooks/app/emails/useEmails.ts b/web/src/lib/api/hooks/app/emails/useEmails.ts
index eb3d94565..5525b7df8 100644
--- a/web/src/lib/api/hooks/app/emails/useEmails.ts
+++ b/web/src/lib/api/hooks/app/emails/useEmails.ts
@@ -1,3 +1,4 @@
+import { useMemo } from "react";
 import { infiniteQueryOptions, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import type GetEmails from "@/lib/api/models/app/emails/GetEmails";
 import getEmails from "@/lib/api/client/app/emails/getEmails";
@@ -42,7 +43,7 @@ export default function useEmails({ query, tag, limit = EMAILS_PAGE_LIMIT, enabl
     });
 
     const rest = useAllPages(queryResult, enabled);
-    const emails = queryResult.data?.pages.flatMap((p) => p.data) ?? [];
+    const emails = useMemo(() => queryResult.data?.pages.flatMap((p) => p.data) ?? [], [queryResult.data]);
 
     return {
         ...queryResult,
diff --git a/web/src/lib/api/hooks/app/listMemoization.test.tsx b/web/src/lib/api/hooks/app/listMemoization.test.tsx
new file mode 100644
index 000000000..cf4ff13dc
--- /dev/null
+++ b/web/src/lib/api/hooks/app/listMemoization.test.tsx
@@ -0,0 +1,150 @@
+import { useMemo } from "react";
+import type * as ReactQuery from "@tanstack/react-query";
+import { renderHook } from "@testing-library/react";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import useEmails from "@/lib/api/hooks/app/emails/useEmails";
+import useCampaigns from "@/lib/api/hooks/app/campaigns/useCampaigns";
+import useSearchContacts from "@/lib/api/hooks/app/contacts/useSearchContacts";
+import useUniboxSearch from "@/lib/api/hooks/app/unibox/useUniboxSearch";
+import useSearchTasks from "@/lib/api/hooks/app/crm/tasks/useSearchTasks";
+import useSearchDeals from "@/lib/api/hooks/app/crm/deals/useSearchDeals";
+import useSearchMeetings from "@/lib/api/hooks/app/meetings/useSearchMeetings";
+import { EMPTY_TASK_SEARCH } from "@/lib/api/models/app/crm/SearchTasks";
+import { EMPTY_DEAL_SEARCH } from "@/lib/api/models/app/crm/SearchDeals";
+import type SearchContacts from "@/lib/api/models/app/contacts/SearchContacts";
+
+type Row = { id: string };
+type Page = { data?: (Row | null)[] | null; pagination: { total: number } };
+
+const state = vi.hoisted(() => ({
+    query: {
+        data: undefined as { pages: Page[] } | undefined,
+        isFetching: false,
+        isError: false,
+        error: null as Error | null,
+    },
+}));
+
+vi.mock("@tanstack/react-query", async (importOriginal) => ({
+    ...await importOriginal<typeof ReactQuery>(),
+    useInfiniteQuery: () => state.query,
+}));
+vi.mock("@/lib/api/hooks/useAllPages", () => ({ default: vi.fn() }));
+vi.mock("@/hooks/useRealtimeFallback", () => ({ default: () => false }));
+
+const contactsOptions: SearchContacts = {
+    query: "", custom_field_filters: [], campaign_ids: [], sort_by: "updated_at", reverse: false,
+};
+
+const lists: { name: string; useList: () => Row[] | undefined; unloaded: Row[] | undefined }[] = [
+    { name: "mailboxes", useList: () => useEmails({ query: "", tag: "" }).emails, unloaded: [] },
+    { name: "campaigns", useList: () => useCampaigns({ query: "", folder: "" }).campaigns, unloaded: [] },
+    { name: "contacts", useList: () => useSearchContacts({ options: contactsOptions }).contacts, unloaded: undefined },
+    { name: "unibox", useList: () => useUniboxSearch({}, "all").emails, unloaded: [] },
+    { name: "tasks", useList: () => useSearchTasks({ filters: EMPTY_TASK_SEARCH }).tasks, unloaded: undefined },
+    { name: "deals", useList: () => useSearchDeals({ filters: EMPTY_DEAL_SEARCH }).deals, unloaded: undefined },
+    { name: "meetings", useList: () => useSearchMeetings({ filters: {} }).meetings, unloaded: undefined },
+];
+
+function page(data: Page["data"]): Page {
+    return { data, pagination: { total: data?.length ?? 0 } };
+}
+
+beforeEach(() => {
+    state.query = { data: undefined, isFetching: false, isError: false, error: null };
+});
+
+describe.each(lists)("$name list", ({ name, useList, unloaded }) => {
+    it("keeps the unloaded shape and loaded row identities/order", () => {
+        const { result, rerender } = renderHook(useList);
+        expect(result.current).toEqual(unloaded);
+        const empty = result.current;
+        rerender();
+        expect(result.current).toBe(empty);
+        const a = { id: "a" }, b = { id: "b" };
+        state.query.data = { pages: [page([a]), page([b])] };
+        rerender();
+        expect(result.current).toEqual([a, b]);
+        expect(result.current?.[0]).toBe(a);
+        expect(result.current?.[1]).toBe(b);
+    });
+
+    it("does not traverse loaded pages on unrelated renders or fetch/error flag changes", () => {
+        const read = vi.fn(() => [{ id: "a" }]);
+        state.query.data = { pages: [{ get data() { return read(); }, pagination: { total: 1 } }] };
+        const { result, rerender } = renderHook(useList);
+        const first = result.current;
+        expect(read).toHaveBeenCalledTimes(1);
+        for (let i = 0; i < 10; i++) {
+            state.query = { ...state.query, isFetching: i % 2 === 0 };
+            rerender();
+            expect(result.current).toBe(first);
+        }
+        state.query = { ...state.query, isError: true, error: new Error("refetch failed") };
+        rerender();
+        expect(result.current).toBe(first);
+        expect(read).toHaveBeenCalledTimes(1);
+    });
+
+    it("recomputes on append, changed row, removal and cache reset", () => {
+        const a = { id: "a" }, b = { id: "b" };
+        state.query.data = { pages: [page([a])] };
+        const { result, rerender } = renderHook(useList);
+        state.query.data = { pages: [...state.query.data.pages, page([b])] };
+        rerender();
+        expect(result.current).toEqual([a, b]);
+        const updated = { id: "a", title: "refreshed" };
+        state.query.data = { pages: [page([updated]), page([b])] };
+        rerender();
+        expect(result.current?.[0]).toBe(updated);
+        state.query.data = { pages: [page([b])] };
+        rerender();
+        expect(result.current).toEqual([b]);
+        state.query.data = undefined;
+        rerender();
+        expect(result.current).toEqual(unloaded);
+    });
+
+    if (name !== "mailboxes") {
+        it("preserves defensive null and missing payload handling", () => {
+            state.query.data = { pages: [page(null), page(undefined), page([{ id: "a" }, null])] };
+            const { result } = renderHook(useList);
+            expect(result.current).toEqual([{ id: "a" }]);
+        });
+    }
+});
+
+it("measures repeated list work with 4,000 mailboxes and periodic immutable refreshes", () => {
+    let pageReads = 0, sorts = 0;
+    const rows = Array.from({ length: 4_000 }, (_, i) => ({ id: String(i).padStart(5, "0") }));
+    function snapshot() {
+        return {
+            pages: Array.from({ length: 20 }, (_, i) => {
+                const data = rows.slice(i * 200, (i + 1) * 200);
+                return {
+                    get data() { pageReads++; return data; },
+                    pagination: { total: rows.length },
+                };
+            }),
+        };
+    }
+    state.query.data = snapshot();
+    const start = performance.now();
+    const { result, rerender, unmount } = renderHook(() => {
+        const mailboxes = useEmails({ query: "", tag: "" }).emails;
+        return useMemo(() => {
+            sorts++;
+            return [...mailboxes].sort((a, b) => b.id.localeCompare(a.id));
+        }, [mailboxes]);
+    });
+    for (let i = 1; i <= 200; i++) {
+        if (i % 20 === 0) state.query.data = snapshot();
+        rerender();
+    }
+    expect(result.current).toHaveLength(4_000);
+    expect(result.current[0].id).toBe("03999");
+    unmount();
+    console.info(JSON.stringify({ fixture: "4,000 mailboxes; initial + 200 renders; 10 refreshes", pageReads, sorts, elapsedMs: performance.now() - start }));
+    expect(pageReads).toBe(220);
+    expect(sorts).toBe(11);
+});
diff --git a/web/src/lib/api/hooks/app/meetings/useSearchMeetings.ts b/web/src/lib/api/hooks/app/meetings/useSearchMeetings.ts
index ab72ffafb..22d1a222b 100644
--- a/web/src/lib/api/hooks/app/meetings/useSearchMeetings.ts
+++ b/web/src/lib/api/hooks/app/meetings/useSearchMeetings.ts
@@ -1,3 +1,4 @@
+import { useMemo } from "react";
 import { infiniteQueryOptions, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import type { MeetingsPage, MeetingsSearch } from "@/lib/api/models/app/integrations/Integration";
 import searchMeetings from "@/lib/api/client/app/meetings/searchMeetings";
@@ -33,9 +34,12 @@ export default function useSearchMeetings({ filters, limit = 50, enabled = true
         enabled,
     });
 
-    const meetings = queryResult.data?.pages
-        .flatMap((p) => p.data ?? [])
-        .filter((m): m is NonNullable<typeof m> => m != null);
+    const meetings = useMemo(
+        () => queryResult.data?.pages
+            .flatMap((p) => p.data ?? [])
+            .filter((m): m is NonNullable<typeof m> => m != null),
+        [queryResult.data],
+    );
 
     const total = queryResult.data?.pages[0]?.pagination.total ?? 0;
 
diff --git a/web/src/lib/api/hooks/app/unibox/useUniboxSearch.ts b/web/src/lib/api/hooks/app/unibox/useUniboxSearch.ts
index 3b8fddae7..777896c71 100644
--- a/web/src/lib/api/hooks/app/unibox/useUniboxSearch.ts
+++ b/web/src/lib/api/hooks/app/unibox/useUniboxSearch.ts
@@ -1,5 +1,6 @@
 // Infinite scroll over the inbox search endpoint.
 
+import { useMemo } from "react";
 import { infiniteQueryOptions, useInfiniteQuery, type InfiniteData } from "@tanstack/react-query";
 import searchIncoming from "@/lib/api/client/app/unibox/searchIncoming";
 import type { UniboxSearchParams } from "@/lib/api/models/app/unibox/UniboxSearch";
@@ -37,10 +38,12 @@ export default function useUniboxSearch(params: UniboxSearchParams, scopeKey: st
 
     // Flatten + drop any null rows just in case the server returns a nil
     // slice (defensive — mirrors the contacts / campaigns hooks).
-    const emails =
-        q.data?.pages
+    const emails = useMemo(
+        () => q.data?.pages
             .flatMap((p) => p.data ?? [])
-            .filter((e): e is NonNullable<typeof e> => e != null) ?? [];
+            .filter((e): e is NonNullable<typeof e> => e != null) ?? [],
+        [q.data],
+    );
 
     return { ...q, emails };
 }