Im CONSTANTLY getting terrible WiFi speeds on my iMacs! WHY?! Same home network. Two iPads great speed. Just tried my work computer, a two year old Macbook Pro gets 19 Mbps download speed and 11 Mbps upload using speediest.net (I dont pay for very top tier speed so thats fine for me). BUT my previous iMac and now my new 2012 iMac are TERRIBLE!!! My current 27 inch iMac is getting 3 Mbps download and 7 Mbps upload, thats friggin awful! I need someone to help me, this ultrafast iMac is worthless with internet speeds this slow Ive read OSX has speed issues that Apple hasn't addressed, but what am I supposed to do here?