Just FYI, in my own tests I've found Node.js performing about 50% better (req/s) than Tornado/C-python, while Tornado/pypy comes very close to Node.js' performa

Just FYI, in my own tests I've found Node.js performing about 50% better (req/s) than Tornado/C-python, while Tornado/pypy comes very close to Node.js' performance. Tornado is one of the fastest Python web frameworks and does not use WSGI (by default). The point is that pypy can crunch almost as fast as Node.js, so while Node.js may set the standard, Python is not bad choice either from performance perspective.