How do I stop unnecessary re-renders in a React UI?
Stabilize references. Use useCallback for functions and useMemo for objects passed to memoized children, and wrap those children in React.memo. This prevents re-renders from new references on every parent render.
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More FAQs in How to Optimize the Performance of a React UI
Measure with the Profiler first, stabilize references with useCallback and useMemo, wrap re-rendering components with React.memo, virtualize long lists, lazy-load images, code split routes, and debounce expensive inputs. Measure throughout to confirm each fix helps.
Because optimization without measurement is guesswork. The Profiler shows which components are actually slow or re-render unnecessarily, so you fix the real bottleneck instead of adding overhead where it is not needed.
Because rendering thousands of items at once is slow. A virtualization library renders only the visible items, which keeps the DOM small and the list fast, regardless of total size.
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