Next.js Lazy Loading

Next.js provides a way to lazy load components and pages. This helps improve the initial load time of the page, since not all the code is loaded at once. To use lazy loading in Next.js, you can use dynamic imports.

Syntax

import dynamic from 'next/dynamic'

const DynamicComponent = dynamic(() => import('../components/DynamicComponent'))

Example

import dynamic from 'next/dynamic'

const DynamicComponent = dynamic(() => import('../components/DynamicComponent'))

function HomePage() {
  return (
    <div>
      <h1>Home page</h1>
      <DynamicComponent />
    </div>
  )
}

export default HomePage

Output

The above code will display the home page and lazy load the DynamicComponent when it's needed.

Explanation

Dynamic imports were introduced in ES2020, and allow you to import a module on demand, instead of loading it all at once when the page is loaded. In Next.js, you can use dynamic imports to lazy load components and pages.

The dynamic() function accepts a function that returns a Promise that resolves to a module with a default export. The returned module will be the component that will be lazily loaded.

Use

Next.js lazy loading can be used to improve website performance by reducing the initial load time of the page. This is especially useful for complex pages with a lot of components. By only loading the components that are needed, the initial load time can be greatly reduced.

Important Points

• Lazy loading in Next.js is accomplished with dynamic imports.
• When using dynamic imports, you must ensure that the module being imported has a default export.
• Lazy loading can help improve website performance by reducing the initial load time of the page.
• Dynamic imports can also be used for code splitting and to keep the bundle size small.

Summary

Lazy loading in Next.js is a powerful technique for improving website performance. By only loading the components that are needed, the initial load time of the page can be greatly reduced. Dynamic imports make it easy to implement lazy loading in Next.js, and can also be used for code splitting to keep the bundle size small.