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Why a parent's re-render re-runs its children, when React.memo, useMemo and useCallback actually help, and how the React Compiler makes the same bailouts fire automatically without making React fine-grained.
React Compiler (babel-plugin-react-compiler, stable 1.0 since 7 Oct 2025) is a build-time Babel plugin that rewrites each component and hook so it memoizes its own intermediate…
The reconciler has always had a cheap bailout: if a fiber's props object is the same reference as last time and it has no pending work, beginWork skips it and possibly its whole…