It's simply a fact that Python is slow; it's an interpreted language. 10 to 15 minutes may still be acceptable in this case, but what if you need to analyze 1 million private keys?
python can handle 1 million private keys.
Or do something more complex with fewer keys?
like what? what would someone be needing to do exactly? other than make a vanity address or crack a bitcoin address.
The same program in C or Rust can easily run 10-100x faster; so instead of 3 months a program would run for a day. That's quite significant.
i'm sure the cpu makes a difference too. get a high end cpu and run python on it and it will be 100 times faster than a low end computer running c.