Core Web Vitals Checker

How fast your main content loads. Slow LCP is the #1 user frustration and a direct ranking signal.

How quickly the page responds to taps and clicks. Poor INP makes a site feel sluggish and unresponsive.

How much page elements jump around as content loads. High CLS causes accidental taps and user frustration.

When the first text or image appears. Fast FCP reassures users that the page is loading.

How fast your server responds. A slow TTFB signals hosting, caching, or database performance issues.

They are an official Google ranking factor. Since 2021, Core Web Vitals have been part of Google's page experience signal. Sites that pass all three have a demonstrable advantage over those that fail in competitive SERPs.

Mobile and desktop are scored separately. Most sites score well on desktop but fail on mobile — where the majority of traffic arrives. Our checker runs both, giving you the full picture.

53% of mobile users leave if a page takes over 3 seconds. Poor LCP directly drives bounce rate. Every second of latency is lost revenue, lost leads, and lost trust — especially for e-commerce and service businesses.

Failing CLS kills conversions. Layout shifts cause users to tap the wrong button or lose their place. Even a CLS score of 0.2 can noticeably reduce form completion and purchase rates.