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Re:Tornado: FriendFeed's non-blocking Python web server is n... by DenisM on Thursday September 10, 2009 @08:25PM (#816509)
The browser-webserver delay resulting from long polling is much larger the frontend-backend delay. I think there is at least an order of magnitude difference there, hence an order of magnitude reduction is the amount of idle state kept on the server.
Re:Tornado: FriendFeed's non-blocking Python web server is n... by RoboTeddy on Thursday September 10, 2009 @10:41PM (#816701)
Yeah, I agree. For long-polling apps it seems like Tornado gives you a huge advantage.

For other web apps though, the frontend-backend delay is comparatively more important, because usually there's a load balancer or reverse proxy in charge of buffering up data arriving from distant/laggy browser connections and hitting the web application server with it all at once.