mypyc keeps Python's "BigIntegers", unicode string implementation, reference counting, and has little to no floating point-related optimizations yet. It priorit

mypyc keeps Python's "BigIntegers", unicode string implementation, reference counting, and has little to no floating point-related optimizations yet. It prioritizes compatibility over overall performance, so I'm not surprised. I was also disappointed at how poor mypyc is at compiling across multiple files, but that they can fix at some point. The BigInteger "issue" pretty much makes something like Fibonacci a worst case scenario for it.