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Performance

Free Core Web Vitals Checker

See how this page performs on key user-experience metrics when PageSpeed / Core Web Vitals data is available.

Focus: LCP · INP · CLS
Free · No signup
Public http:// or https:// pages — the exact page you enter.
⏱ Usually takes 15–30 seconds
By submitting a URL, you confirm that you will use this service only for lawful purposes and will not use it to abuse, disrupt, or gain unauthorized access to websites or systems. Terms of use
📄 Exact page ⏱ 15–30s 🔒 Public URLs only
Guide

What is Core Web Vitals?

Core Web Vitals are metrics Google uses to describe loading (LCP), interactivity (INP), and visual stability (CLS).

Why it matters

These metrics approximate how smooth the page feels — especially on mobile networks.

Common problems

  • Slow LCP (big hero image or slow server)
  • High CLS (elements jumping while loading)
  • Heavy JavaScript delaying interaction

How to fix them

Improve server response, optimize the largest visible image, reserve space for media and ads, and reduce main-thread work.

Example

Example: LCP 3.1s → compress hero image and improve TTFB.

FAQ

What is a good LCP?

Generally under 2.5 seconds. SlowCheck shows your measured value when available.

Does every scan include all vitals?

Only when the measurement provider returns them — otherwise the report says not available.

Is it free?

Yes.

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