MethodsCrUX
Chrome UX Report
Google's public dataset of real-world Core Web Vitals, aggregated from opted-in Chrome users.
CrUX is the field data source behind Google Search's Core Web Vitals assessment and the field section of PageSpeed Insights. It reports the 75th percentile per metric, aggregated monthly across eligible Chrome traffic.
It is invaluable but coarse: monthly, origin- or page-group level, Chrome only, and only for pages with enough traffic. Your own RUM fills those gaps with per-page, real-time, all-browser data.
Related terms
- RUMReal User MonitoringMeasuring performance from the browsers of your actual visitors, on their real devices and networks.
- Synthetic MonitoringScheduled, repeatable tests that load a page in a controlled environment on a fixed interval.
- Lab data vs field dataLab data comes from a controlled test; field data comes from real visitors. Both matter, for different reasons.
- LighthouseGoogle's open-source tool that audits a page in a lab run and scores performance, accessibility, SEO and more.
- p75Percentile (p75)The value below which a given share of visits fall. p75 means 75 percent were at least this fast.
- Web Vitals AttributionThe extra diagnostic data that explains why a metric was slow, not just how slow it was.
- Web AnalyticsTraffic and behaviour measurement: page views, visitors, referrers and journeys, alongside performance.
- Error TrackingCapturing JavaScript errors and failed requests from real sessions, grouped so you see the real problems.
- AlertingNotification rules that tell you when a metric breaches a threshold or degrades, before customers complain.
Monitoring that
belongs in the EU.
Read-only by default: no cookies*, no long-lived identifiers, no US provider in the data path. Live in about five minutes.
Light
€29/month
200,000 pageviews included.
Need debugging and all features? Standard from €99 for 1M pageviews. Enterprise on request. See all plans