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Compared to C, rust compiles much slower. This might not matter on performant systems, but when resources are constrained you definitely notice it. And if the whole world is rewritten in Rust, this will have a non-significant impact on the total build time of a bunch of projects.

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It's been mentioned obliquely, but what's considered "part of the compilation process" is different between Rust and C.

Most of the examples of "this is what makes Rust compilation slow" are code generation related; for example, a Rust proc_macro making compilation slow would be equivalent to C building a code generator (for schemas? IDLs?), running it, then compiling the output along with its user.

Runtime memory issues probably have a significantly higher total cost.

But of course that doesn't negate this cost, but building can always be done on another machine as a way to circumvent the problem.

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