A quick look at the numba docs suggests that it doesn't parallelise any better than regular python - so there's one of my problems. Numba also seems to be rest

A quick look at the numba docs suggests that it doesn't parallelise any better than regular python - so there's one of my problems. Numba also seems to be restricted in the functionality it offers, e.g. currently looks like no user defined types so good for hot loops but not your whole codebase. If you touch the python C API it suggests it can't do full JIT compilation, i.e. sounds like this would happen with any C-extension library code outside the range of supported numpy features. No strings?... I'd love to be shown wrong about this.