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Performance increasing when setting `GOMAXPROCS=1` sounds like an (interesting) edge case for the scheduler. If you ever encounter this again, it would be great to file an upstream issue about this. Go has plenty of built in observability tools (I imagine runtime/trace would be good here) so it'd be easy to get the developers the data they'd need.

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I believe we tried, actually (this was at ZEIT, before it was Vercel, back when we used k8s to also deploy all of our user docker deployments - which of course wasn't the best idea but it worked for the time being).

I regrettably don't remember the outcome though, and don't use either of them anymore to even test them readily, especially not under the same load.

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