PageSpeed Insights Analyzer
Analyze website performance using Google PageSpeed Insights API with Core Web Vitals metrics.
The PageSpeed Insights Analyzer checks the loading speed of up to 10 URLs at once through the Google PageSpeed Insights API. You get performance scores, Core Web Vitals (LCP, INP, CLS) and can switch between mobile and desktop.
How it works
- Enter up to 10 URLs, one per line.
- Click "Analyze Performance".
- Switch between mobile and desktop view and compare scores in the bar chart and the detail table.
Field data vs. lab data
The tool shows two datasets per URL: field data from real Chrome users (CrUX) and lab data from a simulated measurement. Field data reflects real user experience. Lab data is reproducible and helps with debugging but may differ from field values.
The three Core Web Vitals (LCP, INP, CLS) appear in both columns. Google's targets: LCP under 2.5 seconds, INP under 200 ms, CLS under 0.1. You can export all results as CSV.
FAQ
How many URLs can I test at once?
Up to 10 per run. The tool queries each URL individually through the Google API, so the analysis may take a few seconds.
What is the difference between field and lab data?
Field data comes from real Chrome users (CrUX database). Lab data is simulated under controlled conditions. Both are useful: field data shows reality, lab data helps with targeted optimization.
Why is field data sometimes missing?
Google only publishes field data for pages with enough traffic. Low-traffic pages only have lab data available.