Core Web Vitals
Real performance data — not estimates
We pull live Core Web Vitals data for every page you audit. You get the exact same performance metrics search engines use to determine your ranking — LCP, CLS, INP, FCP, and TTFB — for both mobile and desktop.
How It Works
From setup to insight in minutes
Pages submitted for analysis
When you run an audit, each page URL is submitted to Google's PageSpeed Insights API for live performance measurement — not a cache.
Real-world data collected
Performance data comes from the Chrome User Experience Report (CrUX) — real visitor interactions across billions of page views. Field data, not lab data.
All 5 metrics reported per page
LCP, CLS, INP, FCP, and TTFB are reported for both mobile and desktop. Each metric is rated as Good, Needs Improvement, or Poor.
Diagnostic breakdowns provided
For pages failing any metric, we surface the specific resources, scripts, or images responsible — so developers know exactly what to optimize.
What's Included
Every check, explained
10 capabilities included in Core Web Vitals
Why It Matters
The business case for Core Web Vitals
Ranking-accurate data
Google uses real-world Core Web Vitals to rank pages. Estimates can be off by 30–50%. Only field data tells you what Google actually sees.
Mobile and desktop, both
Mobile and desktop performance diverge significantly for most sites. You get separate scores for each device type — and separate recommendations.
Prioritize your worst pages
With per-page scores across your entire site, you can immediately identify the worst-performing pages and focus optimization effort where it'll have the most ranking impact.
Actionable diagnostics
A score alone doesn't tell you what to fix. Our diagnostics surface the specific elements — images, scripts, server response — causing each metric failure.
Explore More
Features that work best together
From the Blog
Learn more about Core Web Vitals
How Third-Party Scripts Destroy Your Core Web Vitals (And How to Fix It)
Third-party scripts are the hidden killer of Core Web Vitals scores. Learn how analytics, ads, and widgets impact performance and proven mitigation strategies.
Mobile vs Desktop Core Web Vitals: Why Your Scores Differ and How to Fix It
Core Web Vitals often score worse on mobile than desktop. Learn why the gap exists and strategies for mobile-first performance optimization.
INP (Interaction to Next Paint): The Complete Optimization Guide
INP replaced FID as a Core Web Vital in 2024. Learn what INP measures, why it matters for SEO, and practical optimization techniques to improve your scores.