Not the parent, but I think the point is that, in the real world, the vast majority of use cases for which Python is slow are ones where you would use an existi

Not the parent, but I think the point is that, in the real world, the vast majority of use cases for which Python is slow are ones where you would use an existing library written in a lower-level language. So questions like "How fast can we make matrix multiplication in Python?" are irrelevant for the vast majority of Python developers because NumPy exists, and it's always going to be faster than anything you can write in pure Python.