Lazy Loading in React

Introduction

Lazy loading is a design pattern that postpones the loading of non-critical resources at the point the page is initially loaded. This can enhance the page's initial load time and overall performance.

What is Lazy Loading?

Lazy loading is a technique where components or resources are loaded only when they are needed, rather than all at once during the initial load. In React, this can be implemented using `React.lazy` and `Suspense`.

Why Use Lazy Loading?

Improved performance by reducing the initial load time.
Better user experience as users can interact with the loaded part of the application sooner.
Reduced resource consumption, which is crucial for mobile users.

How to Implement Lazy Loading

To use lazy loading in a React application, follow these steps:

Import `React.lazy` and `Suspense` from React.
Create a lazy-loaded component using `React.lazy()`.
Wrap the lazy component with `Suspense` to handle loading states.

Code Example:


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

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

function App() {
    return (
        
            My App
            Loading...}>


    );
}

export default App;

Best Practices

Follow these best practices:

Always wrap lazy-loaded components in a `Suspense` component.
Use meaningful loading indicators to enhance user experience.
Consider chunking your code effectively to maximize lazy loading benefits.

FAQ

What is the difference between lazy loading and code splitting?

Lazy loading is a technique to load components only when they are needed, while code splitting is the general concept of splitting your code into smaller bundles that can be loaded on demand.

Can I lazy load non-component resources?

Yes, lazy loading can be applied to images and other resources using techniques such as the Intersection Observer API.