The text is definitely clear about it if you read everything, but the chart could easily be misread as saying that Numba and Cython are 2x faster than hand-writ

The text is definitely clear about it if you read everything, but the chart could easily be misread as saying that Numba and Cython are 2x faster than hand-written Fortran. That's my main objection. I also think that writing a simple C version of this code would serve as a much better baseline than f2py-generated Fortran code. That was definitely an inappropriate labeling of the Python benchmarks on the Julia home page. We fixed it as soon as it was pointed out and I'm grateful to whoever did point that out. I'm just doing the same thing here. Dahua's explanation is very cool and he's really created an incredibly high-quality, comprehensive package for distance calculations. It's great work.