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- Real-User Experience Data
- Lab Diagnostics
- Frequently Asked Questions
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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 audits for each category.
PageSpeed Insights is a tool that gives you a score and suggestions to make your web site faster. You can also use the PageSpeed Modules, Google Public DNS, hosted libraries, and other tools and resources to improve your web performance.
Sep 3, 2024 · Learn how to use the PageSpeed Insights API to get real-world and lab data on web page performance, accessibility, SEO, and PWA conversion. See how to set up an API key, run queries, and interpret the response JSON object.
Learn how to use PageSpeed Insights to optimize your website performance and rank higher in Google search results. Find out how to interpret the scores, follow the recommendations, and debug the issues during page lifetime.
Sep 10, 2022 · Learn how to use Google's PageSpeed Insights tool to analyze and optimize your webpages for speed and performance. Find out what PSI scores mean, how to interpret the Core Web Vitals data, and how to fix the opportunities and diagnostics.
Nov 3, 2021 · Learn about the latest updates and features of PageSpeed Insights, a tool that measures and optimizes your page and site quality. See how to distinguish between lab and field data, view Core Web Vitals assessment, and access additional helpful information.
