My personal conclusion (YMMV), python is fast (and it has been) in all scenario and it can be speed up when is not, scaling it vertically or horizontally with appropriate solutions (even including low level accelerations).
But does it web scale ?<p><a href="https://m.youtube.com/watch?v=b2F-DItXtZs" rel="nofollow">https://m.youtube.com/watch?v=b2F-DItXtZs</a>