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Next.js Speed Insights allows you to analyze and measure the performance of pages using different metrics.

You can start collecting your Real Experience Score with zero-configuration on Vercel deployments.

The rest of this documentation describes the built-in relayer Next.js Speed Insights uses.

Web Vitals

Web Vitals are a set of useful metrics that aim to capture the user experience of a web page. The following web vitals are all included: