Google Core Web Vitals 2026 Complete Guide

Google uses Core Web Vitals as direct ranking signals. A poor score doesn't just create a bad user experience — it actively suppresses your position in search results. In 2026, with AI Overviews dominating the top of search pages, every organic position point matters more than ever.

The Three Core Metrics

LCP — Largest Contentful Paint

Target: under 2.5 seconds

LCP measures how long it takes for the largest visible element (usually your hero image or main heading) to fully render. It's the metric most correlated with perceived load speed.

How to improve it:

INP — Interaction to Next Paint

Target: under 200ms

INP replaced FID in 2024 and measures how quickly your page responds to user interactions (clicks, taps, keyboard input). A sluggish INP makes your site feel broken even if it loads fast.

How to improve it:

CLS — Cumulative Layout Shift

Target: under 0.1

CLS measures visual instability — elements jumping around as the page loads. The classic cause: images without declared width/height, ads that load late and push content down, web fonts that swap.

How to improve it:

Impact on SEO

Google's Page Experience signal bundles Core Web Vitals with HTTPS, mobile-friendliness, and absence of intrusive interstitials. Pages with "Good" CWV scores get a ranking boost. Pages with "Poor" scores get suppressed, especially against competitors with "Good" scores.

How to Measure

For fixing the speed issues that drive poor CWV scores, our 10 ways to speed up your website guide covers every lever you can pull.