Technical SEO FAQ · Core Web Vitals, Performance & HTTP
How do you distinguish lab data from real-user performance data?
Lab data Generated in a controlled testing environment.
Useful for:
- debugging;
- regression testing;
- development.
Field data
Collected from real users under real conditions.
Useful for:
- understanding production performance;
- assessing actual user experience.
Google's Search documentation references Chrome User Experience Report (CrUX) as a source of real-world performance data.
Related questions
- How can third-party scripts affect SEO and performance?
- How do Core Web Vitals influence Technical SEO strategy?
- How do you prioritize performance improvements against other SEO work?
- How does image optimization affect crawling, rendering and user experience?
- How should server performance be considered in Technical SEO?
- How would you diagnose poor LCP?
- How would you investigate a sudden deterioration in Core Web Vitals?
- How would you troubleshoot CLS?
- What typically causes poor INP?