What Core Web Vitals actually measure
Core Web Vitals sound technical, but each one describes a real moment a visitor experiences. There are three of them, and Google looks at all three:
- LCP, Largest Contentful Paint. How long it takes for the main thing on the page, usually your biggest image or headline, to appear. This is the visitor waiting for your page to look ready. Google wants this under 2.5 seconds.
- CLS, Cumulative Layout Shift. How much the page jumps around as it loads. You have felt this yourself: you go to tap a button, an image loads above it, everything shifts down, and you tap the wrong thing. Google wants this under 0.1.
- INP, Interaction to Next Paint. How quickly the page reacts when someone taps or clicks. A page that freezes for a moment after every tap feels broken. Google wants this under 200 milliseconds.
A page passes only if all three are within range. Miss one and the whole page fails, which is why it helps to know exactly which measurement is the problem rather than guessing.
Why Core Web Vitals decide whether people find you
Google uses page experience, including Core Web Vitals, as a ranking signal. A page that fails can be pushed below competitors that pass, so fewer people ever reach it. That is the hidden cost: it is not only the visitors who leave a clunky page, it is the visitors who never arrive because the page ranked lower to begin with. Fixing your Core Web Vitals removes that handicap and makes the page nicer to use for everyone who does land on it.
Core Web Vitals test vs Google PageSpeed Insights
Google PageSpeed Insights is the reference tool for Core Web Vitals, and if you want the raw lab numbers it is excellent. The catch for a small-business owner is that it hands you a wall of metrics and diagnostics and leaves you to work out which ones matter and what to do about them.
PageScore takes the same kind of measurement and turns it into a decision. It tells you whether your pages pass, points to the measurement that is failing, and puts that result next to your speed, SEO, mobile and security scores so you see the whole picture in one place. If you want the deep lab detail, use PageSpeed Insights too. If you want to know what to fix first and why it matters to your enquiries, run the scan below.
Turning a failing result into a passing one
Once you know which measurement is failing, the fixes are usually specific and manageable. Slow LCP normally means compressing oversized images or moving to faster hosting. High CLS normally means setting width and height on images and reserving space for anything that loads late, so nothing jumps. Poor INP normally means trimming heavy scripts and plugins that block the page. The £29 professional audit report lists every Core Web Vitals issue on your site in priority order with the fix for each, across all 20 pages. If you would rather have a site built to pass from the start, the John Hitchens build is a fixed £400, delivered in 2 to 3 days.