Element Timing API: Measure Render Times Beyond LCP in 2026
Tag any image, price, or button with elementtiming and read its real paint timestamp from PerformanceObserver. Practical RUM setup, cross-origin gotchas, and the new Container Timing trial.
Real User Monitoring Articles
Real User Monitoring (RUM) with the web-vitals Library: A Practical 2026 Setup Guide
Set up production Real User Monitoring with Google's web-vitals v4 library. Capture LCP, INP, and CLS attribution data, build a custom collection endpoint, sample smartly, and reconcile field data with Lighthouse — every step with working 2026 code.