React Performance Optimization: A Complete Checklist
Most React performance problems aren't React's fault — they come from unnecessary re-renders and loading more components upfront than necessary.
essential measurement tool before optimizing: React DevTools Profiler
core hooks for avoiding re-renders: useMemo and useCallback
value of optimizing without first measuring the actual problem
The first step in optimizing React performance is actually measuring the problem (via React DevTools Profiler) before guessing at a solution, since optimizing without measuring often improves things that don't actually matter.
Code Splitting and Lazy Loading
Use dynamic import for heavy components not needed immediately (like modals or complex editors), so their code only loads when actually needed.
Avoiding Unnecessary Re-Renders
Make sure functions and objects passed as props aren't recreated on every render without reason (use useMemo and useCallback carefully, not blanket-applied everywhere), and check that large components don't fully re-render for a small change in just one part.
Questions & Answers
Should useMemo and useCallback be used everywhere?
No, blanket overuse can add complexity without real benefit; use them only when there's an actually measured performance problem.
How do I know a component is re-rendering unnecessarily?
React DevTools Profiler visually shows which components re-rendered on each interaction, and why.
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