Use Code Splitting to improve the performance of your React application. Code Splitting is a technique that allows you to split your code into smaller chunks and load them on demand. This can significantly reduce the initial load time of your application and improve the user experience. Code Splitting is especially useful for large applications that have a lot of code and dependencies.

React provides several ways to implement Code Splitting. One of the most common ways is to use dynamic imports. Dynamic imports allow you to load a module on demand, instead of loading it upfront. This can be done using the import() function. For example, if you have a component that is only used in a specific route, you can load it dynamically when the user navigates to that route. This can be done using the React.lazy() function, which allows you to lazily load a component.

Here is an example of how to use React.lazy() to load a component dynamically:

import React, { lazy, Suspense } from 'react';

const MyComponent = lazy(() => import('./MyComponent'));

function App() {
  return (
    <div>
      <Suspense fallback={<div>Loading...</div>}>
        <MyComponent />
      </Suspense>
    </div>
  );
}

export default App;

In this example, we are using React.lazy() to load the MyComponent component dynamically. We are also using the Suspense component to show a loading indicator while the component is being loaded. The Suspense component is a new feature in React 16.6 that allows you to specify a fallback component while waiting for a component to load.