Real User Monitoring: Measuring Web Performance in Production (opens in new tab)

Lab tests (Lighthouse, CI benchmarks) tell you how your app performs on a test machine. Real User Monitoring tells you how your app performs for actual users on their devices, networks, and locations. RUM catches performance issues that lab tests never will — slow connections, memory pressure, ad blocker interference, and geographic variance. This guide covers the RUM implementation at tanstackship.com. Lab vs Field Data Aspect Lab (Lighthouse) Field (RUM) Environment Controlled (Moto G4, slo...