diff --git a/packages/runtime-tests/vitest.pty.config.ts b/packages/runtime-tests/vitest.pty.config.ts
index 4671883..8621453 100644
--- a/packages/runtime-tests/vitest.pty.config.ts
+++ b/packages/runtime-tests/vitest.pty.config.ts
@@ -5,7 +5,14 @@ export default defineConfig({
   plugins: [vueJsx()],
   test: {
     include: ["integration/pty/**/*.test.{ts,tsx}"],
-    fileParallelism: false,
+    // node-pty requires child_process.fork(), not worker_threads, so the pool
+    // MUST be "forks". Each test spawns its own isolated PTY subprocess (no
+    // shared ports/files/global state), so test files parallelize safely across
+    // forked workers — ~3x faster than serial (the PTY suite is the CI's
+    // wall-clock bottleneck). testTimeout stays generous (15s vs ~2s slowest
+    // test) to absorb CPU contention on smaller CI runners.
+    pool: "forks",
+    fileParallelism: true,
     testTimeout: 15000,
     env: { FORCE_COLOR: "3" },
   },