---
title: Troubleshooting Vercel Speed Insights
product: vercel
url: /docs/speed-insights/troubleshooting
canonical_url: "https://vercel.com/docs/speed-insights/troubleshooting"
last_updated: 2026-03-18
type: reference
prerequisites:
  - /docs/speed-insights
related:
  - /docs/security/reverse-proxy
summary: Learn about common issues and how to troubleshoot Vercel Speed Insights.
install_vercel_plugin: npx plugins add vercel/vercel-plugin
---

# Troubleshooting Vercel Speed Insights

> **Availability**: Speed Insights is available on all plans

## No data visible in Speed Insights dashboard

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.


<!-- docsgraph:related -->
## Related pages

> **For AI agents:** Follow these links to understand how this page connects to the rest of the Vercel ecosystem. For the full cross-link map (inbound, outbound, prerequisites, and semantic neighbors), see the .graph.md link below.

- [Query Speed Insights from the Vercel CLI](https://vercel.com/changelog/query-speed-insights-from-the-vercel-cli)
- [Investigate latency issues and slowness on Vercel](https://vercel.com/kb/guide/investigate-latency-issues-and-slowness) — Learn how to use Observability to investigate latency issues and slowness on Vercel.
- [How to troubleshoot stale content returned from the Vercel CDN when using an external proxy or CDN](https://vercel.com/kb/guide/how-to-troubleshoot-stale-content-returned-from-the-edge-network-when-using-an-external-proxy-or-cdn) — Learn how to diagnose and fix stale content issues when using external proxies or CDNs with Vercel. Understand troublesh
- [Vercel Speed Insights Privacy & Compliance](https://vercel.com/docs/speed-insights/privacy-policy) — Learn how Vercel follows the latest privacy and data compliance standards with its Speed Insights feature.
- [Vercel Web Analytics Troubleshooting](https://vercel.com/docs/analytics/troubleshooting) — Learn how to troubleshoot common issues with Vercel Web Analytics.
- [Using Speed Insights](https://vercel.com/docs/speed-insights/using-speed-insights) — Learn how to use Speed Insights to analyze your application's performance data.
- [Accessing Metrics with Vercel CLI](https://vercel.com/docs/speed-insights/accessing-metrics-with-vercel-cli) — Use the Vercel CLI to query Speed Insights metrics from your terminal.
- [Observability Insights](https://vercel.com/docs/observability/insights) — List of available data sources that you can view and monitor with Observability on Vercel.

Full cross-link map for this page: [/docs/speed-insights/troubleshooting.graph.md](/docs/speed-insights/troubleshooting.graph.md)
<!-- /docsgraph:related -->

**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

## Requests are not getting called

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.

## Speed Insights behind a reverse proxy

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](/docs/security/reverse-proxy) 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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