Improve CI Times by 70% (#8530)

packages/core/vitest.config.ts

@@ -28,5 +28,11 @@ export default defineConfig({
         ['json-summary', { outputFile: 'coverage-summary.json' }],
       ],
     },
+    poolOptions: {
+      threads: {
+        minThreads: 8,
+        maxThreads: 16,
+      },
+    },
   },
 });