React Performance Optimization

Performance issues in React apps usually come down to unnecessary re-renders and large bundle sizes.

React.memo

Wrap components in React.memo to prevent re-renders when props haven't changed.

useMemo and useCallback

useMemo caches expensive calculations. useCallback memoizes function references to prevent child re-renders.

const expensiveValue = useMemo(() => {

return computeExpensiveValue(a, b);

}, [a, b]);

Code Splitting

Use React.lazy and Suspense to split your bundle and load components on demand.

React Profiler

Use the React DevTools Profiler to identify which components render most frequently and take the longest.

Conclusion

React performance optimization is about understanding the render cycle and being strategic about when components update. Start with the Profiler, identify bottlenecks, and apply the right optimization technique.