diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 303435c2dd6b2..bce800b66822d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -162,13 +162,14 @@ jobs:
 #
 # The projects are independent by construction (see vitest.config.ts: `ui` is
 # jsdom + StyleX, `node` is everything else), so running them as two jobs
- # costs no duplicate execution and each lane carries roughly half the work.
- # `node` is the heavier lane — locally 570s against the ui project's 244s —
- # so it takes the larger supported runner while `ui` stays on the 2-core arm
- # box.
+ # costs no duplicate execution. They do NOT carry half the work each: on this
+ # CI, `ui` is ~5x the heavier lane, so it takes the larger runner.
 #
- # The repo-wide guardrail steps ride the LIGHTER lane, so the slow one is
- # nothing but tests.
+ # The earlier local figure that put `node` ahead (570s vs 244s) was not a
+ # comparable measurement — only the node run was bounded to a small worker
+ # pool, and node is the project whose cost is per-assertion CLI subprocesses.
+ #
+ # The repo-wide guardrail steps ride `test-ui` (~18s of it).
 #
 # `test` remains a job, so the required check of that name still exists and
 # still reports for every PR. This mirrors the `build` join over
@@ -176,7 +177,7 @@ jobs:
 test-ui:
 needs: [check-scope]
 if: ${{ always() && !cancelled() }}
- runs-on: 2-core-ubuntu-arm
+ runs-on: 4-core-ubuntu
 permissions:
 contents: read
 steps:
@@ -233,7 +234,7 @@ jobs:
 test-node:
 needs: [check-scope]
 if: ${{ always() && !cancelled() }}
- runs-on: 4-core-ubuntu
+ runs-on: 2-core-ubuntu-arm
 permissions:
 contents: read
 steps:
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index c7034b0c984e4..8d6229dc62a1f 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -79,8 +79,11 @@ jobs:
 # independent by construction (vitest.config.ts), so they split cleanly; the
 # typecheck gates need the `pnpm build` they follow, so they stay together in
 # their own lane and take the build with them.
+ #
+ # `ui` is the heavier project by ~4x here, so it takes the larger runner (see
+ # ci.yml's lane comment).
 test-ui:
- runs-on: 2-core-ubuntu-arm
+ runs-on: 4-core-ubuntu
 permissions:
 contents: read
 steps:
@@ -93,7 +96,7 @@ jobs:
 - run: pnpm vitest run --project ui
 
 test-node:
- runs-on: 4-core-ubuntu
+ runs-on: 2-core-ubuntu-arm
 permissions:
 contents: read
 steps:
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