Building High-Performance React Applications

React is one of the most popular frontend frameworks, but as applications grow, performance issues can emerge. This article shares practical performance optimization techniques.

1. Code Splitting and Lazy Loading

Implement component-level code splitting using React.lazy and Suspense:

const HeavyComponent = React.lazy(() => import('./HeavyComponent'));

function App() {
  return (
    <Suspense fallback={<Loading />}>
      <HeavyComponent />
    </Suspense>
  );
}

2. Use React.memo to Avoid Unnecessary Re-renders

const MemoizedComponent = React.memo(({ data }) => {
  return <div>{data}</div>;
});

3. Virtualize Long Lists

For lists with large amounts of data, use react-window or react-virtualized:

import { FixedSizeList } from 'react-window';

const VirtualList = ({ items }) => (
  <FixedSizeList
    height={600}
    itemCount={items.length}
    itemSize={50}
  >
    {Row}
  </FixedSizeList>
);

4. Optimize State Management

• Avoid overusing Context
• Split state appropriately
• Use useMemo and useCallback

5. Image Optimization

• Use WebP format
• Implement lazy loading
• Responsive images

Conclusion

Performance optimization is an ongoing process that requires choosing appropriate strategies based on actual situations. Remember: premature optimization is the root of all evil - measure first, then optimize.