This is pretty wierd...
I have a network on ADSL with a Netopia 3346N modem with a new router connected to it. I have 3 macs that are connected to a switch and the switch is connected a port on the router. Then I have 2 PCs and a behemoth printer connected to the second port on the router.
The PCs fly on the net, but the MACs are super slow. They are actually slow when I connect them directly to the Netopia modem too.
Could this be a wiring issue? Maybe a bad Cat5?