Like noted in that benchmark it's non scientific and it should be taken with a grain of salt - - like any other benchmark. It should be said thought that I have evaluated both Twisted and Tornado on a lot of open connections in production and they did not scale (capped on CPU and used too much memory).<p>Also regarding node.js we run around 8 I think and we plan to introduce more as node.js does not have threads or processes and currently our CPU and memory usage is very low. They are load balanced from our Python servers, but nginx would be a good load balancer as it's non-blocking.<p>It should be said that I have coded a lot in Python and I love Python - - so I don't have any bias and I would gladly use Python if it could scale.