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As a bit of background info, mypyc is “not really” ready for broader use yet. The devs are planning a soft-launch: https://github.com/mypyc/mypyc/issues/780

It is quite promising though, if it becomes more robust and compatible. I also believe they have still only scratched the surface of possible optimizations.

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Yes, this. Actually I first shared it here, because I thought that's cool and could work quite cleanly since mypy works well, but when I actually tried compiling one of my Advent of Code solutions with it, what i got was goto stuffed mess. I know I can't expect nice C code, but i certainly didn't expect gotos.

As for the performance gain - 13.5 s with Python, 9 s compiled. It was a naive implementation of AoC 2020/23, so a lot of array cutting, concatenation etc. So this isn't really math, rather lot of RAM I/O

There's nothing wrong with gotos in compiled code. At the end of the day, machine code is really just a bunch of gotos with other instructions in between.

The reason goto is considered bad is that it can make code hard to follow for humans. Since this is an intermediate step in compilation, that's not an issue here.

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