10 React Performance Optimization Tips You're Probably Missing

React is fast by default, but as applications grow, performance issues can creep in. Here are 10 optimization techniques that are often overlooked but can make a significant difference.

1. Use React.memo Strategically

React.memo prevents unnecessary re-renders of components whose props haven't changed. Only use it for components that are expensive to render.

2. Virtualize Long Lists

When rendering lists with hundreds of items, use virtualization libraries like react-window. These render only the visible items, dramatically reducing DOM nodes.

3. Code Split with React.lazy

Use React.lazy and Suspense to code split your routes and heavy components. This reduces initial load time significantly.

4. Optimize Context Usage

Context re-renders all consumers when the provider value changes. Split your context into smaller, focused contexts to minimize unnecessary re-renders.

5. Avoid Inline Functions and Objects

Creating new function references on every render defeats React.memo. Memoize them with useCallback and useMemo.

6. Profile Regularly

Use React DevTools Profiler to identify performance bottlenecks. Don't guess — measure. The profiler shows exactly which components are re-rendering and why.