That paper shows much more reasonable results: numpy was either similar performance to hand-code C (when the right operation was chosen), or about 3x slower whe

That paper shows much more reasonable results: numpy was either similar performance to hand-code C (when the right operation was chosen), or about 3x slower when it was not. Nothing as crazy as the blog post describes. Shows you really have to know how to use tools properly to get the performance you want.