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 m

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.