Core Web Vitals
Core Web Vitals are three Google metrics that measure real users' experience of a page: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness and Cumulative Layout Shift for visual stability.
The thresholds
| Metric | Measures | Good |
|---|---|---|
| Largest Contentful Paint (LCP) | How quickly the main content appears | 2.5 seconds or less |
| Interaction to Next Paint (INP) | How quickly the page responds to input | 200 milliseconds or less |
| Cumulative Layout Shift (CLS) | How much the layout jumps while loading | 0.1 or less |
Source: web.dev (web.dev: Web Vitals)
Why they matter commercially
- Rakuten 24 saw a 33% higher conversion rate and 53% more revenue per visitor after improving Core Web Vitals (web.dev, Rakuten 24 case study)
- Vodafone improved LCP by 31% and saw 8% more sales (web.dev, Vodafone case study)
- The Economic Times cut LCP from 4.5 to 2.5 seconds and bounce rate fell 43% (web.dev, The Economic Times case study)
See why speed costs customers and web development.
FAQ
Are Core Web Vitals a ranking factor?
They are part of Google's page experience signals. Relevance matters more, but speed always affects conversion.
How do we measure them?
PageSpeed Insights and Search Console show real-user data for your pages.
Published Sep 30, 2026 · Last updated Sep 30, 2026