In this episode, Lucas and Luna dive into the messy reality of Web Vitals measurement. Most developers think their Core Web Vitals scores are accurate, but hidden sampling biases, single-page app quirks, and lab-vs-field mismatches lead to wildly misleading data. Lucas breaks down a real case where a team's Lighthouse score showed a perfect 100, yet real users experienced LCP times over 4 seconds. They discuss the gap between Chrome User Experience Report (CrUX) data and synthetic testing, how session-level aggregation hides p99 issues, and why your analytics provider might be filtering out your slowest users. Luna pushes back on the idea that a single number can capture user experience, and they explore practical fixes: using RUM with proper thresholds, segmenting by connection type, and the one metric you should literally ignore. By the end, you'll know exactly why your Web Vitals score is probably wrong — and what to do about it.

#WebVitals #CoreWebVitals #LCP #CLS #FID #INP #RUM #CrUX #PerformanceMonitoring #Lighthouse #WebPerformance #Frontend #RealUserMonitoring #Technology #FexingoBusiness #BusinessPodcast #WebDev #PerformanceOptimization

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