[denibertovic]

"Tornado only blocks if you do something silly. It's event based, and can keep hundreds of connections open and waiting for it's async response event before actioning/responding the open connection." - Yes pure tornado based apps are probably fine if you know what you are doing.

"Wow, overkill much? Polling is bad, and is exactly the kind of bad solution that a lot of these libraries are in place to prevent developers from needing to do." - Polling is not bad if you have a good use case. You just cannot do non-blocking stuff with Django for instance, or it's very very hard and tricky. Websockets also limit you with the number of connections you can have open at once.