Core Web Vitals are the page experience metrics Google uses as a ranking signal. Since 2021, Google has factored your LCP, CLS, and other performance metrics into search rankings. A slow site doesn't just frustrate visitors — it actively pushes you down in search results.
Our free Core Web Vitals checker uses the same Google PageSpeed Insights API that Google uses internally, giving you the exact numbers Google sees when it evaluates your page. No signup, instant results.
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Free Core Web Vitals Test →How long it takes for the largest visible element (usually a hero image or heading) to finish loading. Google considers under 2.5 seconds good, 2.5-4 seconds needs improvement, and over 4 seconds poor. LCP is the single most impactful Core Web Vital for rankings because it directly measures perceived load speed.
The time until the browser renders the first piece of content — text, image, or SVG. This is when users first see something happening on screen. Under 1.8 seconds is good. FCP matters because a blank white screen for more than 2 seconds causes visitors to hit the back button.
Measures visual stability — how much the page layout shifts while loading. Have you ever tried to tap a button on a mobile page and the page jumped, causing you to tap an ad instead? That's layout shift. A CLS score under 0.1 is good. Common causes are images without width/height attributes, dynamically injected ads, and web fonts that swap sizes on load.
The total time the browser's main thread is blocked by JavaScript, preventing the page from responding to user input. Under 200ms is good. High TBT usually comes from heavy JavaScript frameworks, analytics scripts, and third-party widgets that execute during page load.
The most common fixes are compressing images (especially hero images), deferring non-critical JavaScript, setting explicit width and height on images and iframes, and removing unused plugins or scripts. For a detailed guide, see our post on how to fix a slow website.
For a full audit that checks your Core Web Vitals alongside 80+ other issues across your entire site — with step-by-step fix instructions specific to your CMS — run a full SiteBeat scan.