Lazy Loading in Next.js

Introduction

Lazy loading is an optimization technique that defers the loading of non-essential resources at the initial page load. In Next.js, this technique can significantly enhance performance and user experience.

What is Lazy Loading?

Lazy loading is the practice of loading resources only when they are needed. This can apply to images, components, and even routes in Next.js.

Why Use Lazy Loading?

• Improves page loading speed
• Reduces resource consumption
• Enhances user experience by loading content as needed

How to Implement Lazy Loading

Next.js provides built-in support for lazy loading components using dynamic imports. Here’s how to use it:

Step 1: Dynamic Import of Components

Use the dynamic function from next/dynamic to import components lazily:

import dynamic from 'next/dynamic';

            const LazyComponent = dynamic(() => import('./components/LazyComponent'));
            

Step 2: Usage in JSX

Now, you can use your lazy-loaded component in your JSX:

<div>
                <h1>My Lazy Loaded Component</h1>
                <LazyComponent />
            </div>

Step 3: Adding Loading States

Optionally, you can provide a loading component:

const LazyComponent = dynamic(() => import('./components/LazyComponent'), {
                loading: () => <p>Loading...</p>
            });

Best Practices

1. Lazy load components that are not immediately visible.
2. Use loading indicators to improve user perception during loading.
3. Test performance improvements using tools like Lighthouse.

FAQ