The problem with Cython, in this case, is that in order to get close to C/C++ speed, you end up having to write code that looks an awful lot like C/C++. All of

The problem with Cython, in this case, is that in order to get close to C/C++ speed, you end up having to write code that looks an awful lot like C/C++. All of the Python black magic that let's you write this in 111 lines goes away.