React 18 Performance Optimization Techniques for 2025

React 18 brings a host of performance optimization techniques designed to enhance your web applications. Understanding and implementing these strategies will help you deliver faster, more responsive apps. Let's dive into the key features and how you can leverage them.

• Utilize Concurrent Rendering for smoother UI updates.
• Implement Automatic Batching to minimize re-renders.
• Leverage the Transition API for non-blocking updates.
• Adopt edge functions for faster data processing.
• Explore serverless deployments for scalability.

Concurrent rendering allows React to interrupt a render process to handle more urgent updates. This is particularly useful for maintaining responsiveness in complex applications.

To enable concurrent features, wrap your components using ReactDOM.createRoot() instead of ReactDOM.render().

Automatic Batching

React 18 introduces automatic batching, which groups multiple state updates into a single re-render. This reduces unnecessary renders and improves performance.

Ensure you are using setState correctly within event handlers to take advantage of automatic batching.

The Transition API allows you to mark updates as non-urgent, deferring them to improve responsiveness. This is ideal for transitions and animations.

Wrap non-urgent updates in startTransition() to enable smoother state transitions.

• Failing to use ReactDOM.createRoot()—Switch from ReactDOM.render().
• Overusing manual batching—Rely on automatic batching for efficiency.
• Neglecting edge functions—Integrate them for lower latency.
• Ignoring serverless setups—Consider them for scalable solutions.

• Convert to concurrent features with ReactDOM.createRoot().
• Review state updates for automatic batching opportunities.
• Implement the Transition API where applicable.
• Evaluate edge functions for performance gains.
• Consider serverless architecture for scalability.

• React
• Netlify
• Vercel

• React 18 Documentation
• Vercel's Guide to Edge Functions
• Netlify's Serverless Functions Overview