I have trouble reaching high speed when connecting with AirPort to my BT Voyager 2110 router. Connecting with a cable works great. It seems to be a problem many people have that their wireless connection between the Mac and a router gives only a fraction of the transfer speed compared to when when using a PC and connecting wirelessly to the very same router. Is Mac more sensitive and have compatibility problems? How do I benefit from the same speed I get with PC to my router?