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Make your web pages fast on all devices.
Use PageSpeed Insights, PageSpeed Modules, Google Public DNS, hosted libraries and other tools to make your web site faster and more secure. Learn about the latest performance standards and protocols from Google for Developers.
- Real-User Experience Data
- Lab Diagnostics
- Frequently Asked Questions
Real-user experience data in PSI is powered by the Chrome User Experience Report (CrUX) dataset. PSI reports real users' First Contentful Paint (FCP), Interaction to Next Paint (INP), Largest Contentful Paint (LCP), and Cumulative Layout Shift (CLS) experiences over the previous 28-day collection period. PSI also reports experiences for the experim...
PSI uses Lighthouseto analyze the given URL in a simulated environment for the Performance, Accessibility, Best Practices, and SEO categories.
What device and network conditions does Lighthouse use to simulate a page load?
Currently, Lighthouse simulates the page load conditions of a mid-tier device (Moto G4) device on a mobile networkfor mobile, and an emulated-desktop with a wired connection for desktop. PageSpeed also runs in a Google datacenter that can vary based on network conditions, you can check the location that the test was by looking at the Lighthouse Report's environment block: Note: PageSpeed will report running in one of: North America, Europe, or Asia.
Why do the field data and lab data sometimes contradict each other?
The field data is a historical report about how a particular URL has performed, and represents anonymized performance data from users in the real-world on a variety of devices and network conditions. The lab data is based on a simulated load of a page on a single device and fixed set of network conditions. As a result, the values may differ. See Why lab and field data can be different (and what to do about it)for more info.
Why is the 75th percentile chosen for all metrics?
Our goal is to make sure that pages work well for the majority of users. By focusing on 75th percentile values for our metrics, this ensures that pages provide a good user experience under the most difficult device and network conditions. See Defining the Core Web Vitals metrics thresholdsfor more info.
May 14, 2015 · PageSpeed Insights for Google Chrome has been deprecated. Please use the online version of PageSpeed Insights.
Learn how to use Google PageSpeed Insights to optimize your website performance and rank better in search engines. Find out how to interpret the scores, follow the recommendations, and debug the issues during page lifetime.
- Page speed is the speed at which the page loads for the end user in their web browser.
- Page speed is important because nobody likes to wait. If your website is slow, your potential clients could go to your competitor’s faster website.
- If your page is fully loaded and responsive to user actions within one second, your site is fast. But Google’s search engine uses four core page sp...
- PageSpeed Insights measures First Contentful Paint (FCP), First Input Delay (FID), Largest Contentful Paint (LCP), and Cumulative Layout Shift (CLS).
- Google PageSpeed tools is a collection of resources for optimizing website performance. One of these tools, PageSpeed Insights, helps webmasters va...
Jun 12, 2012 · PageSpeed Insights for Chrome is a Developer Tools extension that analyzes all aspects of the page load, including resources, network, DOM, and the timeline. If you're already familiar with the Developer Tools, you'll find that PageSpeed Insights integrates with a toolset you're already using.
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Mar 23, 2015 · Learn how Google's projects such as PageSpeed, Instant Pages and Public DNS can help developers optimize their web pages and improve browsing performance. Explore the spectrum of performance from Internet protocols to browser to website development.
