Interesting presentation, but it can't be the whole story. Even projects like SciPy which use the most rudimentary data structures (basically just a large array

Interesting presentation, but it can't be the whole story. Even projects like SciPy which use the most rudimentary data structures (basically just a large array of floats) and algorithms (sometimes just looping through the elements in order a few times) see a considerable advantage when rewritten in C. http://www.scipy.org/PerformancePython http://www.scipy.org/PerformancePython