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What are Core Web Vitals? Definition and Website Performance Metrics
Core Web Vitals are a set of user experience metrics defined by Google to measure how real pages load, respond, and remain visually stable. They are used in performance analysis and can influence search experience evaluation.
The current Core Web Vitals focus on loading, interactivity, and visual stability.
Main Core Web Vitals
The main metrics are:
| Metric | What it measures |
|---|---|
| Largest Contentful Paint, LCP | How quickly the main content loads |
| Interaction to Next Paint, INP | How responsive the page is to user input |
| Cumulative Layout Shift, CLS | How much visible content unexpectedly moves |
These metrics are most useful when measured for real users, not only in lab tests.
Why Core Web Vitals matter
Poor Core Web Vitals can hurt user experience, conversion rate, engagement, and SEO performance. A slow or unstable page can cause visitors to leave before they read, click, sign up, or buy.
Core Web Vitals also help teams prioritize performance work. Instead of optimizing abstract technical numbers, teams can focus on user-visible pain.
How to monitor Core Web Vitals
Use real user monitoring to see performance by page, device, browser, country, and traffic source. Segmenting performance data helps reveal issues that lab tests miss.
Swetrix includes performance monitoring so teams can connect Core Web Vitals with analytics, traffic sources, pages, and conversions.
Related terms: page speed, real user monitoring, conversion rate, and search engine optimization.
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