Well I'm thinking you have everything optimized then.

There may be a number of variables which may effect your d/l speed.

Some of which are how fast is the u/l host. For example if they are only u/l at 6 KB/s you won't get a very fast d/l speed even with 9 hosts. 9 x 6 = 54.

It may also depend on how much network congestion there is and distance between hosts.

BTW: My LW is fully optimized and I rarely see more than 9 hosts on a d/l. I have even had 9 hosts on a d/l and couldn't get above 20 KB/s d/l speed. That isn't LW's fault or my connections fault. It was the u/l host just couldn't match my d/l speed potential, because they didn't have an equivalent connection speed. As a side note I have reached d/l speeds of 170 KB/s on multiple d/l going at the same. It was the u/l host were capable of matching my d/l speed potential.

You must remember super fast connections are in the minority. I was a dialup user not so long ago, and the vast number of users cannot afford such a connection.