Real User Monitoring (RUM) Explained | Why Lighthouse Feels Like Old Monk for Frontend Performance

Description

Video create with help of NotebookLM Most frontend teams think performance = Lighthouse score. That belief feels good — like Old Monk. But production doesn’t care about how you feel. It cares about Real User Monitoring (RUM). In this video, we break down Real User Monitoring (RUM) in a practical, frontend-engineering way and explain why Lighthouse and synthetic metrics are not enough to understand real performance issues. You’ll learn: • What Real User Monitoring (RUM) actually is • Why Lighthouse scores can look great while users still feel lag • RUM vs Lighthouse — synthetic metrics vs real user data • Real production examples where Lighthouse passes but RUM exposes problems • How interaction latency (INP) breaks UX after page load • Why post-render JavaScript and task scheduling matter more than bundle size • How frontend teams use RUM to catch silent performance regressions • When RUM makes sense and when it doesn’t This video is not theory. It’s about what happens on real devices, real networks, and real user interactions — the stuff lab tools can’t simulate properly. If you work with: • React / frontend frameworks • Web performance • Lighthouse, Core Web Vitals • Production frontend apps This will change how you think about performance monitoring. Lighthouse shows potential. RUM shows reality. Topics covered: Real User Monitoring RUM explained Frontend performance monitoring Lighthouse vs RUM INP and interaction latency Web performance in production Synthetic vs real user metrics Link - https://www.frontend-junction.com/blog/ajio-rum-performance