diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index 4fb45d50..52487ae3 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -69,7 +69,7 @@ jobs:
 
   codspeed-walltime:
     name: Run CodSpeed walltime
-    runs-on: "codspeed-macro"
+    runs-on: codspeed-macro-x64-ryzen-9950x-ubuntu-24-04
     steps:
       - uses: "actions/checkout@v4"
         with:
@@ -83,7 +83,7 @@ jobs:
       - name: Restore turbo cache
         uses: ./.github/actions/turbo-cache
         # The native addon prebuild links against the host's libstdc++, which
-        # Turbo does not hash; keep GitHub's arm64 runners' builds out.
+        # Turbo does not hash; keep GitHub-hosted x64 runners' builds out.
         with:
           key-suffix: codspeed-macro
       - run: pnpm install --frozen-lockfile --prefer-offline
@@ -136,7 +136,7 @@ jobs:
 
   electron-e2e:
     name: Run electron inbox e2e
-    runs-on: codspeed-macro
+    runs-on: codspeed-macro-x64-ryzen-9950x-ubuntu-24-04
     steps:
       - name: Checkout
         uses: actions/checkout@v6
@@ -190,4 +190,4 @@ jobs:
           working-directory: examples/with-electron-and-walltime
           run: xvfb-run -a pnpm bench:electron
           mode: walltime
-          runner-version: v4.17.7-alpha.2
+          runner-version: latest
diff --git a/examples/with-electron-and-walltime/apps/electron/test/inbox.e2e.ts b/examples/with-electron-and-walltime/apps/electron/test/inbox.e2e.ts
index 0ec20d59..9101407a 100644
--- a/examples/with-electron-and-walltime/apps/electron/test/inbox.e2e.ts
+++ b/examples/with-electron-and-walltime/apps/electron/test/inbox.e2e.ts
@@ -30,6 +30,8 @@ await bench(
       kind: "electron",
       appPath: path.join(appRoot, "out/main/index.js"),
       cwd: appRoot,
+      // Keep Chromium's shared memory in /tmp: CI runners may lack /dev/shm.
+      electronArgs: ["--disable-dev-shm-usage"],
     },
     beforeRound: async ({ page }) => {
       page.setDefaultTimeout(180_000);