Core Web Vitals · AuditJet Glossary
Field Data
Core Web Vitals measurements collected from real users visiting a website in production — as opposed to lab data from controlled test environments.
Field data (also called Real User Monitoring or RUM data) reflects the diversity of real user experiences across different devices, network conditions, and locations. Google uses field data from CrUX for its ranking signals. Field data can differ significantly from lab data — a site may score well in lab tests but poorly in field data due to slow user devices or networks.
Related terms
Core Web Vitals measurements collected in a controlled environment using specified device and network conditions — as opposed to field data from real users.
A public dataset of real user experience data collected by Chrome from opted-in Chrome users across millions of websites.
The collection of performance data from real users visiting a website in production, captured via a JavaScript snippet.
Proactive website monitoring that simulates user journeys from external locations using scripted browser sessions on a scheduled basis.
Frequently asked questions
What is Field Data?
Core Web Vitals measurements collected from real users visiting a website in production — as opposed to lab data from controlled test environments.
How does AuditJet measure Field Data?
AuditJet runs automated Google Lighthouse audits that surface Field Data scores alongside actionable fix guidance. You can track Field Data trends across all your pages and receive alerts when the metric regresses.
Monitor Field continuously
AuditJet tracks Core Web Vitals on a schedule with revenue impact alerts — powered by Google Lighthouse and Google PageSpeed Insights.
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