The Metric System: Making Correct Performance Measurements
summary
Slides trace FireBug back to two simple measurements — pre- and post-load — then maps concrete modern metrics (FCP, FMP, TTFB, Speed Index, LCP, CLS, FID, TTI, TBT) to actionable thresholds: FCP and LCP goal ranges (≈2.5s good, ≥4s harmful), and aggregate visual stability and interactivity bounds. Audits run with Google Lighthouse and analysis via BigQuery compare real user LCP distributions across NBA WNBA PBA and FIBA sites, showing PBA outperforms NBA and proving that targeted measurements reveal where fixes will materially help.
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chapters (18)
- 0:00Intro
- 0:48good morning DOM
- 2:22the evolution of web development.
- 2:38the evolution of web.
- 2:51the evolution of web browser.
- 4:45metric: metrik
- 7:56you can't improve what you can't measure.
- 8:34the metric system. making correct performance measurements.
- 9:40onload.
- 10:29modern development has required modern metrics.
- 11:27Mobile and tablet internet usage exceeds desktop for first time worldwide. (2016)
- 12:49newer metrics.
- 14:04google lighthouse.
- 14:36first contentful paint.
- 20:14core web vitals.
- 28:09lighthouse evolved.
- 29:52user experience evolved.
- 37:01conclusion.
