---
title: What is PageSpeed Insights?
description: "PageSpeed Insights (PSI) is powered by Google Lighthouse, an open-source tool for improving the quality of web pages. It provides both lab data (synthetic testing) and field data (real user metrics from Chrome User Experience Report). **Web.dev Performance:** [https://web.dev/performance/](https://web.dev/performance/) **Core…"
url: "https://ssh-assistant.com/docs/what-is-pagespeed-insights/"
updated: "2025-12-07"
category: Site Load Tester / PageSpeed Insights
---

# What is PageSpeed Insights?

PageSpeed Insights (PSI) is powered by Google Lighthouse, an open-source tool for improving the quality of web pages. It provides both lab data (synthetic testing) and field data (real user metrics from Chrome User Experience Report).

**Web.dev Performance:** [https://web.dev/performance/](https://web.dev/performance/)

**Core Web Vitals Guide:** [https://web.dev/vitals/](https://web.dev/vitals/)

**Lighthouse Documentation:** [https://developer.chrome.com/docs/lighthouse/](https://developer.chrome.com/docs/lighthouse/)

**Chrome UX Report:** [https://developers.google.com/web/tools/chrome-user-experience-report](https://developers.google.com/web/tools/chrome-user-experience-report)