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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 Head Component in Next.js allows you to modify the <head> of a page. Learn more in the Head Component documentation.

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 Analytics, OpenTelemetry, and Instrumentation guides.

Images

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

Fonts

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

Scripts

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

Static Assets

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

Bundle Analyzer

Analyze the size of your JavaScript bundles using the @next/bundle-analyzer plugin.

Analytics

Measure and track page performance using Next.js Speed Insights

Lazy Loading

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

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.

Third Party Libraries

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