I have written "realtime" web applications in Django, using Tornado for websockets (or their emulations). While a pure realtime non-blocking solution might be a

I have written "realtime" web applications in Django, using Tornado for websockets (or their emulations). While a pure realtime non-blocking solution might be able to squeeze out a lot of more performance, it's certainly possible. Realtime web applications require a choreography of communication between server and client, with an unpredictable user and network messing stuff up all the time. Like much of web development it comes down to not going crazy. Otherwise we would be writing web applications in C++ or Java, wouldn't we?