Parallel Execution & Optimisation — quiz

A Playwright suite of 500 E2E tests takes 40 minutes to run serially. The team splits the suite across 5 workers using `--shard`. What is the expected improvement, assuming perfectly balanced shards?

• No improvement — E2E tests cannot run in parallel
• Roughly 5× faster — each shard runs ~100 tests, reducing total wall-clock time to approximately 8 minutes
• 2× faster — parallelism is limited to 2× by Playwright's architecture
• 10× faster — each worker runs tests 10 times faster on parallel hardware