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Did you mean “50-98% decrease in running time”? Just calculating from your 26hrs to 30 mins seems to imply so. In terms of speed that translates to 100% to 5100% increase in speed.

Yes, sorry, typing fast - we knew Go would be faster but not quite on that scale.

Where you using standard optimized libraries (e.g., NumPy for numerical computation) or did you do everything in Python? This kind of increase of speed seems to indicate extremely sloppy Python programming.

Why not go with something like graalpy first? That's much less risk in terms of "we end up slightly changing behavior"

It's the same level of testing for us for either Python2->3 or Go (it's a legacy code base, low automated coverage).

Conversion is now (somewhat) easier, the testing will be the slow part. For the speed improvements, which we also need for a migration from on-prem to cloud, it's a no brainer vs the other options at our disposal (like GraalPy).