Core Web Vitals Checker
These are the real Core Web Vitals of this page, captured live in your browser via the Performance Observer API — the same metrics Google uses for ranking. Interact with the page to populate INP.
Click and scroll around this page to record an INP (Interaction to Next Paint) sample.
🎯 The thresholds (good)
- LCP ≤ 2.5s
- CLS ≤ 0.1
- INP ≤ 200ms
- FCP ≤ 1.8s
- TTFB ≤ 800ms
🔍 What each means
- LCP — when the biggest element paints
- CLS — unexpected layout shift
- INP — input responsiveness
- FCP — first content paint
📌 Field vs lab
This is a lab measurement of one visit on your device. Google ranks on field data (real users) from the Chrome UX Report — use this to debug, then verify with PageSpeed Insights.
Frequently Asked Questions
Are these the same Core Web Vitals Google uses for SEO?
Yes — LCP, CLS and INP are Google's three official Core Web Vitals, plus FCP and TTFB as supporting diagnostics. The difference is that Google ranks on field data aggregated from real Chrome users, while this is a single lab reading on your device — ideal for fast debugging.
Why is INP showing a dash?
INP only records once you interact (click, tap, key press). Click and scroll the page and it will populate with your slowest interaction.