React Performance Optimization Techniques

React is fast by default, but complex apps can slow down. Here's how to identify and fix performance issues.

Best Practices#

Measuring:
✓ Profile before optimizing
✓ Use React DevTools Profiler
✓ Set performance budgets
✓ Test on slow devices

Rendering:
✓ Use React.memo appropriately
✓ Virtualize long lists
✓ Code split routes
✓ Lazy load below-the-fold

State:
✓ Keep state close to usage
✓ Avoid unnecessary updates
✓ Use refs for non-render values
✓ Split large state objects

React performance optimization starts with measurement. Use the Profiler to identify slow renders, apply React.memo judiciously, virtualize long lists, and code split routes. Most importantly, don't optimize prematurely—profile first, then fix actual bottlenecks.

React Performance Optimization Techniques

Measuring Performance#

React.memo#

useMemo and useCallback#

Code Splitting#

Virtualization#

State Management#

Avoiding Common Pitfalls#

Image Optimization#

Best Practices#

Conclusion#

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