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Optimizations

Next.js comes with a variety of built-in optimizations designed to improve your application's speed and Core Web Vitals. This guide will cover the optimizations you can leverage to enhance your user experience.

Built-in Components

Built-in components abstract away the complexity of implementing common UI optimizations. These components are:

  • Images: Built on the native <img> element. The Image Component optimizes images for performance by lazy loading and automatically resizing images based on device size.
  • Link: Built on the native <a> tags. The Link Component prefetches pages in the background, for faster and smoother page transitions.
  • Scripts: Built on the native <script> tags. The Script Component gives you control over loading and execution of third-party scripts.

Metadata

Metadata helps search engines understand your content better (which can result in better SEO), and allows you to customize how your content is presented on social media, helping you create a more engaging and consistent user experience across various platforms.

The Metadata API in Next.js allows you to modify the <head> element of a page. You can configure metadata in two ways:

Additionally, you can create dynamic Open Graph Images using JSX and CSS with imageResponse constructor.

Static Assets

Next.js /public folder can be used to serve static assets like images, fonts, and other files. Files inside /public can also be cached by CDN providers so that they are delivered efficiently.

Analytics and Monitoring

For large applications, Next.js integrates with popular analytics and monitoring tools to help you understand how your application is performing. Learn more in the OpenTelemetry and Instrumentation guides.

Images

Optimize your images with the built-in `next/image` component.

Videos

Recommendations and best practices for optimizing videos in your Next.js application.

Fonts

Optimize your application's web fonts with the built-in `next/font` loaders.

Metadata

Use the Metadata API to define metadata in any layout or page.

Scripts

Optimize 3rd party scripts with the built-in Script component.

Package Bundling

Learn how to optimize your application's server and client bundles.

Lazy Loading

Lazy load imported libraries and React Components to improve your application's loading performance.

Analytics

Measure and track page performance using Next.js Speed Insights

Instrumentation

Learn how to use instrumentation to run code at server startup in your Next.js app

OpenTelemetry

Learn how to instrument your Next.js app with OpenTelemetry.

Static Assets

Next.js allows you to serve static files, like images, in the public directory. You can learn how it works here.

Third Party Libraries

Optimize the performance of third-party libraries in your application with the `@next/third-parties` package.

Memory Usage

Optimize memory used by your application in development and production.