The Google CrUX report, short for the Chrome User Experience Report, is a public dataset of real-world performance data collected from Chrome users who visit your site. Rather than a single lab test, it shows how actual visitors experience your pages, measured through Google’s Core Web Vitals. It is often called “field data” because it comes from the field, meaning real devices and real connections.
What CrUX measures
CrUX gathers anonymised timings from eligible Chrome users and reports them as the Core Web Vitals, the small set of metrics Google uses to describe page experience. In plain terms, it answers three practical questions about your pages:
- How quickly the main content loads (Largest Contentful Paint)
- How stable the layout is as it loads (Cumulative Layout Shift)
- How responsive the page feels when someone interacts (Interaction to Next Paint)
You can read the official definitions of these metrics in the Web Vitals overview, which explains what “good” looks like for each one.
How it feeds page experience
CrUX matters because it is the source of the field data Google references when it talks about page experience, and it is the data shown in the Core Web Vitals report inside Search Console. Because the numbers come from genuine visits, they reflect what your customers actually put up with, not an idealised test. Slow, unstable pages frustrate people and can hold back the pages you most want to perform, which is why improving these scores is part of solid technical SEO.
The practical takeaway: treat CrUX as an honest scorecard of how your site feels to real users, then fix the pages that fall short. If you would like a clear read on your Core Web Vitals and the technical issues behind them, our free SEO audit reviews your field data and sets out what to tackle first.
