> I don't love how the dependency graph looks
After adding this complexity to the project, yes, some of the crates are building in ~3s, if they are the only ones that needed to be rebuilt.
Meanwhile, in a Java project there is none of this artificial crate splitting. Sure, Java projects have other nonsense, but they don't force you to split up projects into tiny pieces to get decent compile times.
Things that have like 420+ dependencies (spring boot + some other requirements). I timed the maven clean compile. And it takes around 2min.
In my experience C# compiles faster, but I still agree with you on all points.
But I've got to say I'm super jealous of the level of introspection the rust compiler allows here. I'd definitely be willing to change a few C# coding patterns in code bases I maintain to benefit build times, but as is, that's a really painful trial and error process. And sometimes you get lucky finding the root cause, but if you don't... well, it's not a great experience.
Woah... now I am the one who have to ask: what the hell are you on about??
I work on Rust and Java projects, if you exclude running tests, Java compiles very very fast compared to pretty much any language... Rust is a lot slower to compile even on the much smaller projects I've worked on... in this post, a very small project (I think it's like 16,000 LoC, it's mentioned in the beginning) was taking over a minute even on hot builds... To get a build to take this long in Java you would need to have several million LoC! Even if you don't use something like Gradle to cache compilation units and just compile everything from scratch with javac.