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Use PageSpeed Insights, PageSpeed Modules, Google Public DNS, hosted libraries and more to make your web site faster and more secure. Learn about the latest web performance standards and best practices from Google.
- Public DNS
Public DNS - Make the Web Faster | Google for Developers
- Read Docs
PageSpeed Insights (PSI) reports on the user experience of a...
- Get Started
Use the PageSpeed Insights API to: Measure the performance...
- Release Notes
PageSpeed Insights UI has a new look and home. Check it out!...
- Runpagespeed
Runpagespeed - Make the Web Faster | Google for Developers
- PageSpeed Tools
Make the Web Faster. PageSpeed Module. Run PageSpeed on your...
- Overview
PageSpeed. PageSpeed is an open-source project started at...
- Public DNS
Web.dev offers tools and resources to help you improve your web page performance and user experience. Learn about web performance, check out what's new, and access documentation and guides.
- 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.
Jan 27, 2023 · Learn how to use PageSpeed Module and PageSpeed SDK to improve the speed and efficiency of your web site or application. PageSpeed Tools are open source and licensed under the Apache 2.0 License.
Jan 10, 2024 · Use the PageSpeed Insights API to: Measure the performance of a web page. Get suggestions on how to improve the page's performance, accessibility, and SEO. Learn how to convert the page into a...
Mar 23, 2015 · Learn about Google's projects and products to optimize web performance, such as PageSpeed, Instant Pages and Public DNS. Find out how to use them and join the effort to make the web faster.
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.
