That's the right answer, but it's not helpful for people who don't get to make the call on what language to use. Moreover, a lot of people don't think an applic

That's the right answer, but it's not helpful for people who don't get to make the call on what language to use. Moreover, a lot of people don't think an application will have a performance problem until suddenly it does (either because of scale or shifting requirements or whatever). Even worse, a whole lot of people simplistically believe that you can just throw C/multiprocessing/numpy at any Python performance problem, which is how you make Python even slower and less maintainable.