Example
A filter click waits behind a long main-thread task before the updated results can paint, producing slow interaction feedback.
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Glossary · Core Web Vitals
Interaction to Next Paint measures page responsiveness across user interactions using field data.
INP summarizes the latency of interactions during a page visit, with defined outlier handling. Diagnose it with real-user field evidence and traces; a single lab click is not the field metric.
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Why it matters
Delayed feedback makes navigation, forms and controls feel broken even when the page initially loads quickly.
In practice
Use field percentiles, then debug the interaction path.
Measurement
Use current Core Web Vitals field guidance, typically evaluating the 75th percentile by origin or URL group where sufficient data exists.
Application
Trace input delay, processing and presentation delay; reduce main-thread contention and validate both lab behavior and later field data.
Thresholds and reporting rules can evolve. Verify current official web performance documentation before setting contractual targets.
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Connect performance evidence to governed technical changes.
Choose paid technical monitoring and production capacity when your repository is ready.