Numpy slow at vector cross product?

[Skip Montanaro]

> I'm simply suggesting there is plenty of room for improvement. I even
showed a version that did *exactly* what numpy does (AFAIK) that was three
times the speed of numpy even executed by CPython. So there is some mystery
there.

As I indicated in my earlier response, your version doesn't pass all of
numpy's cross product unit tests. Fix that and submit a patch to the numpy
maintainers. I suspect it would be accepted.

Skip