Why not a Python to machine code compiler like Cython, but much faster and with all Python 3 capabilities? (e.g. as GNU gcj for Java) Getting 30x speed up with

Why not a Python to machine code compiler like Cython, but much faster and with all Python 3 capabilities? (e.g. as GNU gcj for Java) Getting 30x speed up with compiled code using optimized data structures (e.g. pointer compression for better data cache usage, etc.), although not reaching performance of best JIT implementations, it could be good enough.