Speed Insights not working with SvelteKit app

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Hi,

I have followed all the steps in the Speed Insights Quickstart:

  • I have enabled Speed Insights in my Project Settings.
  • I have installed the @vercel/speed-insights package.
  • I have added a /src/routes/+layout.ts file to my SvelteKit app:
import { injectSpeedInsights } from '@vercel/speed-insights/sveltekit';
 
injectSpeedInsights();
  • I have committed and pushed that change to my repo at Github and can see that it was deployed to Vercel in my project’s “Deployments” tab.

But, for some reason, I do not see the /_vercel/speed-insights/script.js script inside the body tag of any page on my site.

I do have a server-side +layout.server.ts file as well as a universal +layout.ts, but, according to the SvelteKit docs, this should be OK: " If a route contains both universal and server load functions, the server load runs first."

I previously tried calling injectSpeedInsights() in my server-side +layout.server.ts, and, strangely, it worked for a little while, and I got some initial Speed Insights data, but it has since stopped working.

I feel like I’m missing something obvious, so any suggestions on how to troubleshoot this would be very welcome.

Thanks in advance,
Michael

2

Hey @michaelyoon. Do you have a minimal reproducible example I can use to investigate what’s going wrong? I wasn’t able to repro it with my test app, so I’m wondering if there’s another feature interfering. Would be good for us to work from the same code to debug this :slightly_smiling_face:

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Hi @amyegan, thanks for getting back to me. I’ll see if I can put one together and get back to you ASAP.

1 Like
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Hi again, it looks like Speed Insights is now working for me. Maybe it just took some time for the data to show up?

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