The Chrome User Experience Report (CrUX) is Google's official source of field data for Core Web Vitals. It collects anonymous performance data from Chrome users who have opted in to usage statistic reporting.
Why CrUX matters
CrUX data is the same data Google uses to evaluate pages for the page experience ranking signal. If you want to know how Google sees your performance, CrUX is the definitive source.
CrUX metrics
CrUX includes data for:
- Largest Contentful Paint (LCP)
- Interaction to Next Paint (INP)
- Cumulative Layout Shift (CLS)
- First Contentful Paint (FCP)
- Time to First Byte (TTFB)
CrUX data sources
- CrUX API: Programmatic access to CrUX data
- BigQuery: Full dataset for analysis
- PageSpeed Insights: Visual representation
- Google Search Console: Core Web Vitals report
How VitalSentinel handles this
VitalSentinel's CrUX Monitoring pulls your origin and per-URL CrUX data automatically, tracks LCP, INP, and CLS over time, and alerts you when the 75th percentile slips out of the "Good" range. It is the same dataset Google uses for ranking, surfaced without writing BigQuery or polling the API yourself.
Related Terms
Core Web Vitals
A set of three metrics defined by Google that measure the loading performance, interactivity, and visual stability of a web page.
Field Data
Performance metrics collected from real users in production environments, as opposed to lab data collected in controlled testing conditions.
PageSpeed Insights
A Google tool that analyzes web page content and provides suggestions to make pages faster, combining both lab and field data.
Real User Monitoring (RUM)
A type of performance monitoring that captures and analyzes data from actual user sessions visiting a website.