It's an 802.11G (G only) network with an Airport Extreme. All computers on the network run 10.5 and have either G or N speed wireless cards. 802.11G is supposed to be 54mbit/sec. If I set the multicast rate of the network to 2, I get 8mbit/sec. If I set it to 24 (the maximum), I get 11.2mbit/sec. It's on a channel which no other networks are on, the computer are within 5 meters of each other, and there's no interference. Why is my network so slow?