Performance

Each extension test launches a fresh Chromium process and installs the extension. Running too many tests in parallel can make these browser processes compete for CPU and memory, slowing down the suite instead of speeding it up.

We recommend keeping 1–3 Playwright workers for extension tests. Compare total run times on your machine to choose a worker count within this range. Set workers in your Playwright configuration file:

playwright.config.ts

import { defineConfig } from '@playwright/test';

export default defineConfig({
  workers: 3,
});