I have an Airport Extreme Base Station, an Apple TV and two Airport expresses (1 is dead). Hooked up to my network, I have an iMac G5, a MacPro and an IBM ThinkPad. I occasionally hook up my older powerbooks and my friends log into the network. I have a 4meg connection, but I notice when I have the 802.11 b/g compatible the network goes slow, internet speed is clocked at 764 kbps whereas when its on just 802.11n mode just my mac pro can connect i get 3.5 mbps. What settings do I need to configure in b/g mode so I have a password on my network and all computers can connect at the speed for which I'm paying?