What are Core Web Vitals?

Core Web Vitals are the three metrics Google uses to measure how your pages actually feel to a real visitor — and they feed into search ranking, so they are worth knowing by name:

• Largest Contentful Paint (LCP) — how long until the biggest thing on screen (usually the hero image or headline) has loaded. Measures perceived load speed.
• Cumulative Layout Shift (CLS) — how much the page jumps around as it loads. Measures visual stability.
• Interaction to Next Paint (INP) — how quickly the page responds when someone taps or clicks. Measures responsiveness.
• They are scored on real visitors — Google grades each at the 75th percentile of your actual traffic, not a one-off lab test.

You can see your own scores free in Google PageSpeed Insights. Fix the worst-scoring of the three first — that is where you will feel the difference and where Google does too.