I recently got an iMac with built in airport, and it is currently beside my old computer which has an external linksys usb wireless adapter. I only recently noticed my download speeds weren't too good on the site I use the most rapidshare.com/de I got a maximum of around 300kb/s so I decided to compare that with my old pc with the same file + browser. It got 450kb/s no problem. So whats causing this significant slowdown, is it hardware or programs running that could be sucking away my bandwidth? And incase you are wondering i'm currently on a 4mb cable connection.