Core Web Vitals glossary definition

Core Web Vitals are the specific website speed and experience signals Google uses to judge how your pages feel in real life. If your scores are weak, you usually see it in the numbers that matter, lower rankings, fewer clicks, and higher bounce rates from visitors who hit a slow page.

What Core Web Vitals measure

Think of them as three checks, each tied to a problem you can actually fix:

LCP (Largest Contentful Paint), how fast the main page content shows up. If your hero image or headline takes too long, people leave.
INP (Interaction to Next Paint), how responsive the page feels when someone clicks or taps. Buttons that lag create frustration fast.
CLS (Cumulative Layout Shift), how much the layout jumps while loading. Moving buttons or jumping text kills trust, and it causes wrong clicks.

Why this matters to your leads and sales

Core Web Vitals affect user behavior before SEO even kicks in. If your booking page or contact form loads slowly, you lose leads during peak intent. If your product page keeps shifting, people click the wrong option, then abandon. Fixes are not about pleasing robots, they protect conversion.

Here is the part most owners miss: you can have fast home page speed, but a slow template used on product pages, blog posts, or landing pages drags your overall results. One heavy slider, a few large images, or too much script on the wrong pages can wreck LCP and INP.

How to use this glossary term in your next project

When you hire someone or start a redesign, ask for a Core Web Vitals plan. You want to see which pages are failing, which metric is failing, and what change fixes it. Reports should show real URLs, not just averages.

Check your key pages, homepage, service pages, pricing, and forms.
Track LCP and INP for pages with lots of images or scripts.
Test on mobile, because most revenue traffic is there.

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