Speed Insights Overview

Vercel Speed Insights provides you with a detailed view of your website's performance metrics, facilitating informed decisions for its optimization. For granular visitor data, turn to our Web Analytics.

By enabling Speed Insights, you gain access to the Speed Insights dashboard, which offers in-depth information about scores and individual metrics without the need for code modifications or leaving the dashboard. It's the key to analyzing your site's performance parameters without the hassle of introducing new scripts or headers.

Once enabled, you'll see an interface where gathered data can be sorted and inspected based on a variety of parameters:

• Device type: switching between mobile and desktop
• Environment: filtering by preview and/or production environments
• Time range: varying from the last day up to the last 12 months (duration varies depending on the account type)
• Performance metric: switching between parameters that include Real Experience Score (RES), First Contentful Paint (FCP) and Largest Contentful Paint (LCP)
• Performance metric views: displaying the P75 percentile of data for the selected metric data points and time range in multiple views:
  • Time-based line graph showing P75 by default. You can include P90, P95 and P99 in this view only
  • Kanban board showing which routes, paths or HTML elements need improvement (URLs that make up less than 0.5% of visits are not shown by default)
  • Geographical map showing the experience metric by country