Why does code splitting matter in React?
It keeps the initial bundle small by breaking it into chunks loaded on demand, usually via React.lazy and Suspense. Users load faster, especially on slow networks, because they only download the code for the page they visit.
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More FAQs in React Performance and Optimization Interview Questions
Measure with the Profiler first, then optimize the real bottlenecks: useMemo for expensive computations, stabilize prop references with useCallback, virtualize long lists, code split routes, and debounce expensive inputs. Never optimize blindly.
useMemo memoizes a value, useCallback memoizes a function. useMemo is for expensive computations, useCallback is for stable function references passed to memoized children. Both prevent unnecessary work but serve different cases.
React.memo wraps a component so it re-renders only when its props change by reference. It is used with useCallback and useMemo to prevent re-renders when the parent re-renders but the props have not meaningfully changed.
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