The Elevator Button Analogy
Imagine pressing an elevator call button. If the button lights up instantly within a millisecond, you feel confident the elevator is coming. But if the button does nothing for 3 full seconds before lighting up, you get frustrated and press it repeatedly thinking it is broken!
This instant responsiveness is what Google measures with INP (Interaction to Next Paint). It measures how long a user has to wait after clicking a button, link, or tab before the browser visually updates the page.
The Core Web Vitals Trinity for 2026
Google evaluates your user experience using three strict metrics:
| Metric | What It Measures | Good Score Target |
|---|---|---|
| LCP (Largest Contentful Paint) | Main hero image/text load speed | Under 2.5 seconds |
| INP (Interaction to Next Paint) | Visual response time on click/tap | Under 200 milliseconds |
| CLS (Cumulative Layout Shift) | Visual stability (elements jumping) | Under 0.1 score |
3 Fast Fixes to Boost Your INP Score
- Break up long Javascript tasks: If a button click runs a heavy Javascript loop, use
requestAnimationFrameorsetTimeoutto let the browser paint the active state before processing logic. - Minimize main-thread blocking: Defer non-critical third-party analytics scripts so they don't block user interactions.
- Avoid layout thrashing: Calculate element dimensions once rather than repeatedly reading and writing DOM properties inside event handlers.
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