I have a gigabit network at home connecting all my computers. All with cat 6 cables / router etc. When transferring from PC to PC the speeds are excellent - -80 to 90 MB per sec. Mac to Mac is fine also. PC to mac and vise versa is painfully slow - 1- 3 MB / sec. PC's are running Win 7 ultimate. Macs are all snow leopard. WTF is going on??