[neonsunset]

Hmm, usually the application start latency is very good. Significant improvements have been made to ensure that Tier-0 compiles fast. A base ASP.NET Core template takes about 120ms to start on my machine as tested with .NET 8 and Hyperfine (I modified it with starting the server with await app.RunAsync, then raising a CancellationToken on it in 10ms which outputs an error message in console about the fact and exits).

There is a good chance something else might be going on in one of the dependencies or perhaps some other infra package a team maintains, that slows this down. Sometimes teams publish SDK images on accident that have to be pulled over the network if they got evicted from the node cache, or try to use self-contained instead of runtime image + plain application - I know at least two cases where this was causing worse than desired deployment speed on GKE (arguably GKE is as much at fault here, but that's another topic).

[stackskipton]

It's very likely it's some library but at this point, I'm over caring. It's 20 seconds, everyone can cope with deployment rollout in Kubernetes taking 3 minutes.