Renodevs team · 1 min read ·
Core Web Vitals are Google’s measurements of how a page feels to use. They are part of the page experience signals, and more importantly they track things visitors notice: waiting, lag and jumping content.
Largest Contentful Paint (LCP): how fast the main content appears
LCP measures when the biggest element, often a hero image or headline, is visible. To improve it, compress and properly size images, serve them in modern formats, preload the main image and reduce slow server responses.
Interaction to Next Paint (INP): how quickly the page responds
INP measures the delay between a tap or click and the page reacting. Heavy JavaScript is the usual cause. Load only the scripts a page needs, split large bundles and avoid long tasks on the main thread.
Cumulative Layout Shift (CLS): how stable the layout is
CLS captures content that jumps while loading, such as images without set dimensions or late-loading banners. Reserve space for images and embeds, and avoid inserting content above what the visitor is already reading.
How to measure
- PageSpeed Insights shows lab and real-user data for a URL.
- The Core Web Vitals report in Search Console groups pages that need work.
- Chrome DevTools helps find the specific scripts and images causing delays.
Fixing vitals is not a one-time job. New plugins, large images and third-party scripts can undo good work, so check again after each major release.
