Speed Insights Metrics

While many performance measurement tools, like Lighthouse, estimate user experience based on lab simulations, Vercel's Real Experience Score (RES) uses real data points collected from your users' devices.

As a result, RES shows how real users experience your application. This real-time data helps you understand your application's performance and track changes as they happen.

You can use these insights to see how new deployments affect performance, helping you improve your application's user experience.