The state of responsiveness on the web
summary
Chrome introduces Interaction to Next Paint (INP) as an experimental full-page responsiveness metric that measures the duration from user input to the next visual paint for all discrete interactions, picking the worst interaction per page and evaluating the 75th percentile. Findings: FID pass rate is 95% but only 67% of origins meet the 200 ms threshold for INP; INP catches issues FID misses (for example bot-detection libraries that run heavy scripts after first input). Measure and debug with web-vitals.js, CrUX, the Web Vitals Chrome Extension, PageSpeed Insights and Lighthouse user flows.
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chapters (7)
- 0:00Defining responsiveness
- 2:50The need for better metrics
- 4:40Limitations of current metrics
- 6:13Introducing INP
- 8:21Measuring INP in the field
- 10:25INP thresholds and definition
- 13:55Call to action
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