# Field data

Measurements from real users; lab data: measurements from a simulated load.

**Source:** “Lab data is generated through Lighthouse, simulating page load and providing diagnostics on performance, accessibility, best practices, and SEO.” [About PageSpeed Insights (Google for Developers)](https://developers.google.com/speed/docs/insights/v5/about)

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Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/glossary/field-data