Which @angular/* package(s) are relevant/related to the feature request?

No response

Description

It can be hard to follow which components are affected by a change detection cycle, especially when OnPush is in play or the app has complicated data flow. It can be unexpected that interacting with one component causes a completely different component to trigger change detection, and this is often indicative of performance bugs.

Proposed solution

DevTools could have a "Highlight Change Detection" mode (similar to hydration overlays) which gives a brief flash to any components which are checked. This would give a visual indication of the rendering performance impact of a specific user interaction and help highlight where potential optimizations are.

Alternatives considered

Don't?