Google PageSpeed Insights
SupportingSite Audit
PageSpeed Insights is Google's free page performance checker, pairing real-user field data from the Chrome User Experience Report with a simulated Lighthouse lab run and reporting the three Core Web Vitals for mobile and desktop.
ABOUT GOOGLE PAGESPEED INSIGHTS
The distinction PageSpeed Insights makes between field and lab data is the
part most people skip. Lab data is a simulation and can be tuned; field data
is what actual Chrome users experienced over the previous 28 days, and it is
the half that feeds the Core Web Vitals assessment. A URL with too little
traffic shows no field data at all, which is not the same as passing.
OVERVIEW
- Who is it for?
- Developers, technical SEOs and site owners diagnosing why a specific page loads or responds slowly.
- Problem
- A page can feel fast on a developer's machine and still fail Core Web Vitals for real visitors on mid-tier phones and slower networks.
- Solution
- PageSpeed Insights reports both sides - 28 days of real-user field data from the Chrome User Experience Report and a controlled Lighthouse lab run - then lists prioritised opportunities. It reports LCP, CLS and INP for mobile and desktop, and is free with no account required.
- What makes it unique
- Showing field and lab data side by side on one screen, so a passing lab score that contradicts real-user data is immediately visible rather than hidden.
KEY FEATURES
- Field data from the Chrome User Experience Report over a trailing 28-day window
- Lab data from a simulated Lighthouse run on an emulated mid-tier mobile device
- Core Web Vitals reporting for LCP, CLS and INP
- Separate mobile and desktop reports for the same URL
- Performance, Accessibility, Best Practices and SEO audit categories
- Prioritised opportunities and diagnostics per page
COMPANY
- Publicly traded
- Yes
Where ZPlatform covers Google PageSpeed Insights
Ranked in
Best-of lists that rank this tool alongside others.
Featured in
Substantial standalone coverage - not a numbered ranking.
Sources
- PageSpeed Insights documentation - Documentation · checked Sep 5, 2026
- PageSpeed Insights tool - Homepage · checked Sep 5, 2026