How often should I run PageSpeed Insights on my site?

Running the tool after major site changes or once a month is sufficient for most sites to track performance trends and catch new issues.

Does PageSpeed Insights test my site on real devices?

No, it uses lab data from a simulated Chrome environment; real-user monitoring requires separate tools or analytics integration.

Can I use PageSpeed Insights for a site I don't own?

Yes, you can enter any valid URL, but the results reflect how the page loads in a controlled environment, which may differ from the experience of your own visitors.

What are Core Web Vitals and why do they matter?

Core Web Vitals are three specific metrics—Largest Contentful Paint, First Input Delay, and Cumulative Layout Shift—that Google uses to measure loading, interactivity, and visual stability; higher scores correlate with better user experience and can influence search rankings.

Developer ToolsFree Tool

PageSpeed Insights

Provided byPageSpeed Insightspagespeed.web.dev

Measures the real-world performance of a web page on mobile and desktop, reporting Core Web Vitals and specific optim...

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performance seo

Screenshot of PageSpeed Insights on PageSpeed Insights — pagespeed.web.devOpen the live tool →

About this tool

What PageSpeed Insights does

PageSpeed Insights analyzes a submitted web page and returns a performance score along with Core Web Vitals ratings for both mobile and desktop. The output includes a list of specific optimization opportunities, diagnostics, and passed audits, giving users a clear picture of what is working and what needs improvement. The report is structured to help developers and site owners prioritize fixes that affect loading speed and user experience. This site’s version stands out because it runs audits in a simulated Chrome environment and provides separate mobile and desktop scores, allowing users to see how their page performs on different screen sizes. The interface is minimal and focused: after entering a URL and clicking Analyze, the results page lists opportunities, diagnostics, and passed audits with brief explanations. It also links to the Web Performance documentation, offering context that many other performance checkers do not include directly on the results screen.

Step by step

How to use the PageSpeed Insights PageSpeed Insights

1
Enter the full URL of the web page you want to test in the input field
2
Click the Analyze button to start the performance audit
3
Review the mobile and desktop scores and the Core Web Vitals summary
4
Scroll through the Opportunities, Diagnostics, and Passed Audits sections for specific recommendations
5
Use the provided links to Web Performance documentation for deeper explanation of each item

Is it right for you

Best for

Developers, website owners, and digital marketers who need a quick, free performance audit of a live page and want clear, actionable recommendations for both mobile and desktop experiences.

Limitations

Results are based on lab data using simulated conditions, not real-user monitoring
The tool does not provide unit conversion or detailed server configuration guidance
Some advanced diagnostics may require familiarity with web performance terminology

Questions

PageSpeed Insights FAQ

How often should I run PageSpeed Insights on my site?: Running the tool after major site changes or once a month is sufficient for most sites to track performance trends and catch new issues.
Does PageSpeed Insights test my site on real devices?: No, it uses lab data from a simulated Chrome environment; real-user monitoring requires separate tools or analytics integration.
Can I use PageSpeed Insights for a site I don't own?: Yes, you can enter any valid URL, but the results reflect how the page loads in a controlled environment, which may differ from the experience of your own visitors.
What are Core Web Vitals and why do they matter?: Core Web Vitals are three specific metrics—Largest Contentful Paint, First Input Delay, and Cumulative Layout Shift—that Google uses to measure loading, interactivity, and visual stability; higher scores correlate with better user experience and can influence search rankings.

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