How I learned to stop worrying and love UX metrics
summary
Argues there is no single “unicorn” metric and demonstrates concrete options, using SpeedCurve, WebPageTest, synthetic and RUM data, Lighthouse and custom UserTiming marks. Shows surprising correlations (BBC ~10% user loss per extra second, Ancestry +7% conversion after a 64% load improvement) and cross‑site checks (many first paints happen before start render). Recommends visual sanity checks with filmstrips, start render, speed index, and site‑specific hero rendering times plus performance budgets and custom timers.
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chapters (4)
- 0:00Start
- 13:46amazon start render repeat visits
- 19:52An analysis of Chromium's paint timing metrics
- 31:54First Click First Scroll First Key First Input Delay
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