Troubleshooting Vercel Speed Insights

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:

1. Double check if you followed the quickstart instructions correctly
2. Check if your adblocker is interfering with the Speed Insights script. If so, consider disabling it

If is correctly loading but not sending any data (e.g. no 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, as it may interfere with the proper functioning of Speed Insights.

How to fix:

1. Check your proxy configuration to make sure that all desired pages are correctly proxied to the deployment
2. Additionally, forward all requests to to the deployments to ensure proper functioning of Speed Insights through the proxy