Core Web Vitals & Page Performance Analyzer
Check Core Web Vitals for any page: real-user LCP, INP and CLS from the Chrome UX Report, plus a Lighthouse performance score and the top fixes, from Google PageSpeed Insights.
Tool Configuration Options
What is a Core Web Vitals & Page Performance Analyzer?
Core Web Vitals are the three page-experience metrics Google uses in ranking: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). This checker asks Google PageSpeed Insights for two kinds of data: field data from real Chrome users over the last 28 days, which is what Google ranks on, and a lab test run by Lighthouse right now, which helps you find what to fix.
Execution Privacy:Toolbrix processes this utility using☁ Server-assisted — the URL is sent to Google PageSpeed Insights, which loads the page and returns real-user and lab metrics.
How to use this Core Web Vitals & Page Performance Analyzer
Enter the full URL of the page, for example https://example.com/pricing.
Pick mobile or desktop. Google uses mobile data for most sites.
Click Run Tool and wait 15–40 seconds while Google loads the page.
Read the assessment first, then the lab metrics and the top opportunities.
Frequently Asked Questions
Q:What are good Core Web Vitals scores?
LCP of 2.5 s or less, INP of 200 ms or less and CLS of 0.1 or less, measured at the 75th percentile of visits.
Q:Why is there no real-user data for my page?
The Chrome UX Report only includes pages and sites with enough Chrome traffic. Newer or smaller sites only get the lab test.
Q:Why do my lab and field results differ?
The lab test is one simulated visit on a throttled phone. Field data is many real visits on many devices and networks. Rankings use field data.
Q:Does this replace PageSpeed Insights?
It uses the same Google API and shows the key numbers in one place. Open pagespeed.web.dev for the full report.
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