MSDN Community - React Optimization

Why Optimize React?

React applications can become sluggish as the UI grows. Proper optimization improves user experience, reduces CPU usage, and leads to smoother interactions.

Key Techniques

• Memoization – React.memo and useMemo
• Virtualization – Render only visible list items (e.g., react-window)
• Lazy Loading – Code‑splitting with React.lazy and Suspense
• Avoiding Re‑renders – Proper dependency arrays in useEffect, immutable state updates
• Profiler – Using the React Profiler API to measure render times

Live Demo: Rendering 10 000 Items

Sample Code

{`// Optimized List Component
import React, { memo, useState, useEffect } from 'react';
import { FixedSizeList as List } from 'react-window';

const Row = memo(({ index, style }) => (
  <div style={style}>Item #{index}</div>
));

export default function OptimizedList({ count }) {
  return (
    <List
      height={400}
      itemCount={count}
      itemSize={35}
      width={'100%'}
    >
      {Row}
    </List>
  );
}`}