No serious issues -- Socket.IO was really good. But SockJS was noticeably faster, and we saw fewer cases where things arrived out-of-order -- blog post here: h

No serious issues -- Socket.IO was really good. But SockJS was noticeably faster, and we saw fewer cases where things arrived out-of-order -- blog post here: http://blog.pythonanywhere.com/27/ http://blog.pythonanywhere.com/27/ Also, IIRC the code we had to write to handle reconnects on patchy connections with SocketIO was pretty gruesome. The problem was that if the connection dropped, it would fail down from WebSockets through various polling systems (which is correct behaviour) but would then stop at the last failover option and never recover, even when the connection came back up. We poked around in the code trying to work out how to change this, but found it too confusing. SockJS didn't have this problem, and we also found the code a bit easier to read, at least from a fairly shallow overview.