[necro]

Here is a pic of the transaction client side. The RTT is about 50ms. This is an intitial, non keep alive, request.

http://www.pinkbike.com/photo/4632455/

Notice that after the connection and the http request, in 1RTT you basically receive 10 segments at flight time (right after each other) This means the server is not waiting for you to ack. You see the acks in this picture (but note the times as they are sent but dont arrive till rtt at the server)

With out altering slow start the server would wait to receive and ACK before sending more segments.

There are 2 factors at play here... 1. slow start 2. window size Does not matter what the window size advertised, as slow start normally start at 2 segments. So in this case the client window is something huge. The advertised 5880 is the server receive window which also grows.