diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 38dc974b1c9..c833849941b 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -155,7 +155,11 @@ jobs:
     name: static analysis
     needs: [code_paths]
     if: needs.code_paths.outputs.static_analysis == 'true'
-    runs-on: ubuntu-latest
+    # Why ARM: measured 128s against 172s on ubuntu-latest, with every compute step faster --
+    # type-aware 24s->15s, anti-slop 28->19s, localization extraction 67->46s, the orcad smoke
+    # 39->14s. Both lint engines ship linux-arm64 and the Bun target follows process.arch, so
+    # the whole toolchain resolves. Free for public repositories, same as the typecheck job.
+    runs-on: ubuntu-24.04-arm
 
     steps:
       - name: Checkout