Nobody believes me here; maybe I should take measurements sometime to show it. It's always puzzled me that Unity devs aren't up in arms about how slow compilation and domain reload is in that engine!
My feeling is that rustc has had so much performance work done on it that we need radical solutions in order to really move the needle, e.g. JIT compilation
Perhaps bootstrapping a build with rust-analyzer's work if it's running? If you're running VS Code in the background, rust-analyzer has already done the typechecking and is holding that data in memory, might as well reuse it instead of having to do it again when you cargo build
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I'm talking about improving caching across compiler jobs and eliminating link costs where possible.
e.g. https://bsky.app/profile/mcy.gay/post/3lnvrl4koek2w