Free Core Web Vitals audit with fixes
HubSEO's free Core Web Vitals audit evaluates Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) against real lab and field thresholds. It delivers exact CSS and image optimization recipes to achieve green scores across all metrics.
Official Google Core Web Vitals Performance Benchmarks
Core Web Vitals are three key metrics that measure the real-world user experience of loading speed, visual stability, and interaction responsiveness on your website.
| Metric | Good (Fast) | Needs Improvement | Poor |
|---|---|---|---|
| Largest Contentful Paint (LCP) | ≤ 2.5s | 2.5s – 4.0s | > 4.0s |
| Interaction to Next Paint (INP) | ≤ 200ms | 200ms – 500ms | > 500ms |
| Cumulative Layout Shift (CLS) | ≤ 0.1 | 0.1 – 0.25 | > 0.25 |
Frequently Asked Questions
How do I run a free Core Web Vitals test?
Enter your domain in the input above to launch an instant Chromium lab audit that benchmarks LCP, INP, CLS, and TTFB.
What is the difference between lab and field data?
Lab data is measured in a controlled synthetic environment, while field data (CrUX) reflects actual user experiences over 28 days.
Why does Core Web Vitals affect SEO?
Google uses Core Web Vitals as an official ranking signal for mobile and desktop search results.
How do I fix LCP issues?
Optimize hero images, enable priority preloading, eliminate render-blocking CSS, and preconnect to third-party font servers.