Optimizing React Apps With Code Splitting and Lazy Loading

Large React applications can become sluggish if the JavaScript bundle grows too big. Code splitting and lazy loading are powerful techniques to break your app into smaller chunks, improving load times and performance. Here’s how to apply them effectively.

Why Code Splitting?

React apps are often bundled into a single large JavaScript file. This increases initial load time. Code splitting breaks that file into smaller pieces that load only when needed.

Step 1: Use React.lazy and Suspense

React provides built-in support for code splitting using React.lazy and Suspense. Here's a basic setup:

import React, { Suspense } from "react";

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

function App() {
  return (
    

      
My App
      Loading...
}>