title: Comet performance issue
body: <p>I'm studying about implementing Comet in my application.
  I got that for each request there should be an open connection between client and server.
  No suppose in my application I have 10 requests (push data from server to client), and I have just 10 users online, now I should have 100 (10*10) open connections between client and server.
  Is it OK?
  It doesn't have any performance issue?</p>