Core Web Vitals turn “the site feels slow” into measurable targets. Hitting them helps both users and rankings.
The three to watch
Largest Contentful Paint measures load speed, Interaction to Next Paint measures responsiveness, and Cumulative Layout Shift measures visual stability. Each maps to a real frustration.
Fixes that move the needle
Optimise and lazy-load images, reserve space for media to stop layout jumps, defer non-critical scripts, and ship less JavaScript. Most failures trace back to bloated pages.
Measure on real mobile devices, not just your fast laptop.
