How to Optimize React Performance?

Posted by devGuru • 3 hours ago

I've been working on a large React application and noticed some performance bottlenecks. What are the best practices for optimizing rendering and minimizing unnecessary re-renders?

  • When to use React.memo?
  • How to effectively use useCallback and useMemo?
  • Any tools for profiling?

Replies (2)

JaneDoe 2 hours ago

Great question! Here are some tips:

  1. Wrap components that receive props but don’t need to re‑render with React.memo.
  2. Use useCallback for functions passed as props to prevent new references.
  3. Leverage useMemo for expensive calculations.
  4. Consider code splitting with React.lazy and Suspense.

Also, the React DevTools Profiler is excellent for spotting slow renders.

CodeMaster 45 minutes ago

Don't forget about virtualization for long lists. react-virtualized or react-virtual can dramatically improve performance.

Also, keep an eye on the number of context providers; too many can cause re-renders.

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