Web Reference: Jul 23, 2021 · The useCallback hook is used to memoize the functions to prevent unnecessary re-renders, while useMemo is used to memoize the computed outputs, and useEffect performs sideEffects in a React application. Mar 25, 2026 · Clear explanation of React's useMemo, useCallback, and React.memo with real performance benchmarks. Learn when these optimizations help, when they hurt, and how to measure the difference. Nov 24, 2025 · Even if your components “look” lightweight, React may be doing more work than you think. This is where memoization tools like React.memo, useMemo, and useCallback come into the picture.
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