What are Core Web Vitals?

Google Core Web Vitals measure LCP, INP and CLS — user experience signals for ranking and UX.

Largest Contentful Paint (LCP) tracks main content load; Interaction to Next Paint (INP) measures responsiveness; Cumulative Layout Shift (CLS) catches visual jumps. Field data in CrUX beats lab-only scores.

Heavy client JS and unoptimized images hurt vitals. Tentaco static-first tool pages aim for fast LCP — local WASM loads after first paint on many modes.