Interestingly, on my machine, all 3 implementations took the same amount of realtime (~30s), but the ractor implementation took ~200s in systemtime. I'm guessin

Interestingly, on my machine, all 3 implementations took the same amount of realtime (~30s), but the ractor implementation took ~200s in systemtime. I'm guessing the ractor switching overhead ate up whatever parallelization gain it got.