# Core Web Vitals

> Core Web Vitals are Google’s three metrics of real user experience on a page: how fast the main content appears (LCP), how quickly the page reacts to input (INP) and how much the layout shifts while loading (CLS).

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**Definition:** Core Web Vitals are Google’s three metrics of real user experience on a page: how fast the main content appears (LCP), how quickly the page reacts to input (INP) and how much the layout shifts while loading (CLS).

**Example:** A home page with a huge hero video takes four seconds to show its headline on a phone; compressing the video and showing a still image first brings the main content up much sooner.

## Common mistakes

- Testing only on a fast office computer: most visitors come from phones on mobile networks.
- Chasing a perfect 100 score instead of fixing what users actually feel.
- Confusing a one-off lab test with field data collected from real visitors.

Related service: [Website improvement](https://veilvex.com/services/website-improvement/)

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