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Discover tools and techniques from Chrome to improve your site's performance.
Test a site with PageSpeed Insights

DevTools

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DevTools is a suite of tools that lets you inspect and debug the behavior of web applications running on a computer, including web pages, web workers, and extensions.
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Use DevTools to inspect and debug the performance of your site, including the rendering and layout of elements, the execution of JavaScript, and network activity.
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The Features reference section provides detailed information about each feature, including the performance metrics that it measures and the factors that contribute to those metrics.
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The Timeline event reference section provides detailed information about each event type that appears in the Performance panel's Timeline.
insights
Insights are actionable recommendations that help you improve the performance of your site.

Lighthouse

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Lighthouse is a tool that lets you quickly and easily audit the performance of a web page.
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Understand how Lighthouse calculates the performance score for your site.
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The metrics section provides detailed information about each performance metrics that Lighthouse measures.
insights
Insights are actionable recommendations that help you improve the performance of your site.
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Diagnostics are additional information that Lighthouse provides to help you understand and debug issues with your site's performance.
COURSE

Web performance is a crucial aspect of web development that focuses on the speed at which pages load, as well as how responsive they are to user input. When you optimize your website for performance, you're giving users a better experience. Better user experiences go a long way toward helping you achieve the goals you had in mind for your website.

This course from web.dev is designed for those new to web performance.

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