Largest Contentful Paint
A Core Web Vital measuring the render time of the largest image, video poster or text block visible in the viewport; good is 2.5 s or less…
TechnicalCWV
Core Web Vitals
Google's set of three field-measured user experience metrics — LCP, INP and CLS — used as part of the page experience signals in ranking.
In full
Core Web Vitals measure loading (Largest Contentful Paint), interactivity (Interaction to Next Paint) and visual stability (Cumulative Layout Shift). A URL is judged 'good' when the 75th percentile of real-user samples is at or below 2.5 s LCP, 200 ms INP and 0.1 CLS, evaluated separately for mobile and desktop. Interaction to Next Paint replaced First Input Delay as the responsiveness metric in March 2024. Google updates the metric set on an announced, roughly annual cadence.
Example
A retailer's mobile LCP sits at 3.8 s at p75; compressing the hero image to AVIF and preloading it brings it under 2.5 s.
Related terms
Interaction to Next Paint
A Core Web Vital measuring overall responsiveness as the latency of the worst (approximately) interaction on a page; good is 200 ms or…
Cumulative Layout Shift
A Core Web Vital scoring unexpected visual movement of page content, computed from the largest burst of layout shifts; good is 0.1 or less…
Chrome User Experience Report
Google's public dataset of real-user performance measurements from opted-in Chrome users, and the official source of Core Web Vitals…
Page experience
Google's umbrella term for signals about how users perceive interacting with a page, including Core Web Vitals, HTTPS and absence of…
Where to read more
- Chrome UX Report (CrUX) Documentation · Documentation · developer.chrome.com
- Chrome UX Report on BigQuery · Dataset · console.cloud.google.com
- Cumulative Layout Shift (CLS) · Documentation · web.dev
- Evaluating Page Experience for a Better Web · Landmark Post · developers.google.com
- Interaction to Next Paint (INP) · Documentation · web.dev
- Largest Contentful Paint (LCP) · Documentation · web.dev