Mark Dickinson added the comment: I've always viewed the `Fraction` type as more of a teaching tool than something intended for real-world calculations. If that's not how others see it, then it might be worth investing some effort in reimplementing `Fractions.gcd` in C: the `Fraction` type is almost unusably slow for serious work, and the gcd computations are a clear bottleneck. I've experimented in the past with a C-based implementation of Lehmer's algorithm for gcd computation, getting around a ten-fold speedup.
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