Why keep state local for optimization?
Because lifting state to a parent causes all children that depend on it to re-render when it changes. State that only one component needs should stay local, so changes stay scoped and do not ripple through the tree.
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More FAQs in Render Optimization Best Practices With React Hooks
Measure with the Profiler first, use useMemo for expensive computations, useCallback for stable handlers passed to memoized children, combine with React.memo, keep state local, and avoid inline object and function references as props.
Because optimization without measurement is guesswork. The Profiler shows which components are actually slow or re-render unnecessarily, so you optimize the real bottleneck and do not add overhead where it is not needed.
Wrap a child in React.memo so it only re-renders when props change by reference. Pass stable values with useMemo and stable functions with useCallback, so the child does not re-render when the parent re-renders but props have not meaningfully changed.
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