Learn how the Chrome UX Report (CrUX) collects field data from real Chrome users, aggregates metrics, and powers PageSpeed Insights, Search Console, and Core Web Vitals - including origin vs URL behavior, sample thresholds, FID to INP, and why lab scores differ from CrUX.
Improve frontend performance by uncovering hidden Largest Contentful Paint bottlenecks when PageSpeed Insights looks fine. Practical Chrome DevTools workflow: cache-free sessions, throttling, and Performance panel analysis.
Frontend performance testing depends on viewport truth: resolution vs viewport vs device width, why Lighthouse uses 412px and 1350px, and how DPR maps hardware pixels to CSS - so web vitals scores reflect comparable lab conditions.
Frontend performance vs lab scores: why Lighthouse can be low while Core Web Vitals still pass. Learn lab vs field data, web vitals signals, and what to trust for real users.
Why frontend performance and web vitals dashboards move slowly: a real-world case study on Google's rolling 28-day CrUX window, Search Console timing, and the idle-period myth.