Sure, but the claim he's making is that D is faster than the numpy numerical algorithms. This is patently false. The C or fortan code that is doing the numerica

Sure, but the claim he's making is that D is faster than the numpy numerical algorithms. This is patently false. The C or fortan code that is doing the numerical calculation is as fast or faster than the D code he's running. Al of the difference comes from the initialization of O(n) pyobjects to represent the returned values. If he claimed that handwritten D code was faster than equivalent python, I'd say "duh", but he claimed that the numerical libraries are faster. I take issue to the statement that D will be faster than numpy for real world calculations, because the numpy code will run the actual math faster, and the python overhead will still be on the order of nano or milliseconds.