Core Web Vitals
Core Web Vitals are three metrics Google uses to measure real-world page experience: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability).
The three metrics
Largest Contentful Paint (LCP): how fast the main content appears. Good: 2.5 seconds or less.
Interaction to Next Paint (INP): how quickly the page responds to input. Good: 200 milliseconds or less.
Cumulative Layout Shift (CLS): how much the layout jumps while loading. Good: 0.1 or less.
Google measures these with data from real Chrome users. They are a ranking signal, and more importantly they shape whether visitors stay.
Large images, heavy scripts and third-party embeds are the usual causes of poor scores. Read more in why site speed matters.
FAQ
How do I check Core Web Vitals?
With Google PageSpeed Insights, Search Console’s Core Web Vitals report, or Lighthouse in Chrome DevTools.
Is Lighthouse the same as Core Web Vitals?
No. Lighthouse is a lab test on one device. Core Web Vitals in Search Console are based on real-user data.
Related terms
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Conversion rate optimization (CRO) is the practice of increasing the share of website visitors who take a desired action, such as booking a demo, signing up or buying, through research, better design and testing.
JSON-LD (structured data)
JSON-LD is a format for adding structured data to a web page: a small block of code, using the schema.org vocabulary, that tells search engines and AI systems exactly what the page is about, such as an organisation, article, product or FAQ.
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