Core Web Vitals
Core Web Vitals are three scores Google uses to measure how fast and stable your site feels to real visitors — how quickly it loads, how soon you can interact with it, and how much it jumps around while loading.
Also known as: page experience signals
In plain English
Core Web Vitals are Google's way of putting a number on something you already feel: is this site fast and smooth, or slow and clunky? There are three. How quickly the main content loads. How fast the page responds when you tap or click. And how much things shift around on screen while it's still loading — that annoying jump that makes you tap the wrong button. Google measures all three from real visitors, not a lab test.
Why it matters for your business
Two reasons. First, customers: people leave slow, jumpy sites, and you never see the sale you lost. Second, Google: Core Web Vitals are part of how it ranks pages, so poor scores can quietly hold you back in search. Good scores help you keep visitors and get found. Bad ones cost you on both.
The good news
Core Web Vitals are very fixable. Most of the damage comes from oversized images, too many plugins, and slow hosting — all things that can be tuned without rebuilding your site.
Common questions
- How do I check my Core Web Vitals?
- Free tools like Google PageSpeed Insights give you all three scores from real-world data, with simple pass/fail ratings. It's the same data Google uses, so it's a good place to see exactly where you stand.
- Do Core Web Vitals really affect my Google ranking?
- They're one of many ranking factors — not the biggest, but a real one, and they matter more when competitors are close. The bigger payoff is usually keeping the visitors who'd otherwise leave a slow page.
Related terms
Run into this on your site?
Speed Optimization