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PageSpeed Insights is a tool that analyzes the performance of your web pages on different devices and provides suggestions for improvement. Learn how to use it, what's new, and more about web performance.
- Core Web Vitals | web.dev
We want to help you build beautiful, accessible, fast, and...
- Core Web Vitals | web.dev
More on PageSpeed Insights What's new Documentation Learn about Web Performance Ask questions on Stack Overflow Mailing list
Use PageSpeed Insights to get your PageSpeed score and suggestions for making your web site faster. Learn how to use PageSpeed Modules, Google Public DNS, hosted libraries, and other tools and standards to improve your web performance.
- Real-User Experience Data
- Lab Diagnostics
- Frequently Asked Questions
- GeneratedCaptionsTabForHeroSec
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.
PageSpeed Insights (PSI) reports on the user experience of a page on both mobile and desktop devices, and provides suggestions on how to improve it. PSI also uses Lighthouse to analyze the page performance, accessibility, best practices, and SEO, and shows the scores and metrics for each category.
May 14, 2015 · PageSpeed Insights is a tool that analyzes the performance of web pages and suggests optimizations. The Chrome extension has been deprecated and the online version should be used instead.
Jun 12, 2012 · PageSpeed Insights analyzes all aspects of a web page load and points out the specific things you can do to make your page faster.
Page speed is an important ranking attribute for search engines, making performance optimization a prerequisite for successful sites. Here’s how Google PageSpeed Insights can help identify and rectify performance issues.
