Core Web Vitals (Google Search Central)
Google’s own documentation defining Core Web Vitals as the set of metrics it uses to measure real-world loading, interactivity, and visual-stability quality.
License: CC BY 4.0 — confirmed via the page’s own footer notice; accompanying code samples are Apache 2.0.
Key points
- Largest Contentful Paint (LCP) measures loading speed; the target is completion within 2.5 seconds.
- Interaction to Next Paint (INP) measures responsiveness; the target is under 200 milliseconds.
- Cumulative Layout Shift (CLS) measures visual stability; the target is a score under 0.1.
- Recommends monitoring a site’s own scores via Google Search Console’s Core Web Vitals report and consulting web.dev for optimization strategies specific to each metric.