description Vercel Speed Insights Overview
Vercel Speed Insights analyzes a website’s loading time and identifies key performance bottlenecks like image optimization, server response times, and render-blocking resources to provide actionable recommendations for improvement.
help Vercel Speed Insights FAQ
Does Vercel Speed Insights use lab tests or real visitor data?
It collects field data from actual browser visits after the Speed Insights script is installed. The dashboard reports Core Web Vitals rather than merely running a one-time simulated Lighthouse test.
Which Core Web Vitals does Speed Insights track?
It tracks loading, responsiveness, and visual-stability measurements, including Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift. Results can be segmented by factors such as device and route.
Does Speed Insights work on preview deployments?
Yes. Once enabled, Vercel can collect measurements from both preview and production deployments. This helps reveal whether a performance regression appeared before or after a release.
How is Vercel Speed Insights priced?
It is available across Vercel plans, with a limited Hobby allowance and paid Pro usage. Vercel's 2026 pricing lists a $10 per-project monthly Pro fee plus metered data points beyond included usage.
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