Measurement
PageSpeed Insights
Google PageSpeed Insights (PSI) is a free tool from Google that analyzes the performance of a web page for both mobile and desktop devices, providing a performance score (0–100) based on Google Lighthouse metrics along with real-world Core Web Vitals data from the Chrome User Experience Report (CrUX). It was developed by the Google Chrome team.
PageSpeed Insights provides both lab data (Lighthouse-generated) and field data (real-user CrUX metrics) including LCP, FID/INP, CLS, and FCP. Its actionable recommendations — categorized as Opportunities and Diagnostics — guide optimizations that are also tracked via Google Search Console's Core Web Vitals report.
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Related Terms
Measurement
FCP (First Contentful Paint)
Refers to the point at which the first pixel renders on a screen after a user navigates to a web page.
Measurement
Lighthouse
An open source performance analysis tool developed to improve the performance of websites.
Measurement
TTFB (Time to First Byte)
Refers to the time between the browser requesting a page and when it receives the first byte of information from the server.
Technical SEO
Website Speed Optimization
Refers to practices to provide faster access to websites.