Performance
Interaction to Next Paint (INP)
Replaced FID as a Core Web Vital in March 2024. Measures responsiveness across the full page lifecycle — clicks, taps, key presses — not just the first interaction. ≤200ms is the bar.
What it is
Interaction to Next Paint — measures the time from a user input (click, tap, key press) to the next visual update, across every interaction on the page. Reported as the worst (or near-worst, after outlier filtering) interaction during the visit. Promoted from experimental to stable Core Web Vital on 12 March 2024, replacing First Input Delay.
Why it matters
FID only measured the first interaction's input delay; it under-counted laggy SPAs and over-credited static pages. INP catches the post-hydration jank, the third-party tag-fired-on-click stalls, and the long render tasks that make a site feel sluggish. The 200ms `good` threshold is achievable with disciplined JS — but bloated React apps without code-splitting routinely exceed 500ms.
Who it applies to
Every interactive site — i.e. every site.
How WQI scores it
Web Quality Index considers this standard satisfied when the supporting factor passes.
| # | Factor | Status |
|---|---|---|
| 34 | Core Web Vitals from CrUX (Real User Monitoring) | planned |
0 of 1 supporting factors are currently collected. Sites where the remaining 1 haven't been measured will show as partial or unknown on this standard until the data lands.