Summary

Investigate a performance regression introduced in React 19.1.1 that causes significant rendering delays when Chrome DevTools is open. The issue appears to be related to the interaction between React's rendering process and DevTools, impacting both manual testing and automated Playwright headful tests.

Skills Required

Files Likely Touched

• packages/react-reconciler/src/ReactFiberReconciler.js
• packages/react-dom/src/client/ReactDOMRoot.js
• fixtures/attribute-behavior/src/index.js
• packages/react-reconciler/src/ReactFiberHooks.js

Labels