Rust compiler performance is hard to have meaningful discussions about because: (1) There’s no single part of the compiler which is slow. In fact the compiler is pretty well optimized.
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The thing was, there wasn't a lot of improvement in run-time performance of the compiled code between the two. On typical "dusty deck FORTRAN" you could expect a factor of two at best from the optimized code.
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So if run-time performance was critical, you might prototype / develop / debug with the fast compile time compiler and then optimize for production. And then when you found out that the optimizer's code gave incorrect results ...
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