Troubleshooting Vercel Speed Insights
Speed Insights is available on all plans
If you are experiencing a situation where data is not visible in the Speed Insights dashboard, it could be due to a couple of reasons.
How to fix:
- Double check if you followed the quickstart instructions correctly
- Check if your adblocker is interfering with the Speed Insights script. If so, consider disabling it
If /<unique-path>/script.js is correctly loading but not sending any data (e.g. no vitals request), ensure that you're checking for the request after navigating to a different page, or switching tabs. Speed Insights data is only sent on window blur or unload events.
We do not recommend placing a reverse proxy in front of Vercel. A proxy can affect IP-based data, including the country breakdown and geographic map. It can also prevent Speed Insights from receiving events if it does not forward the requests.
Point your domain directly to Vercel. If you must use a proxy, review the reverse proxy guidance for supported options and requirements. Make sure your proxy forwards all pages you want to track, plus requests to /_vercel/speed-insights/* and /<unique-path>/*, to your Vercel deployment.
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