"Dear" Intel please read this forum too ! ->
Intel Wireless-N 1030 Horrible Wireless N Speeds When its BlueTooth is Enabled
I think this is the problem, I mean the Wifi+Bluetooth combo. When I disable the Bluetooth (everywhere in the Device manager, Win7) my internet speed working well on max speed, when I enable the Bluetooth the internet speed is very slow many times, turn off/on the Wifi solves the problemfor a while and then it slow downagain.
On every Centrino forum many people wrote this solution, disabled the BT fixed the problem, butthis is onlya temporary solution,because I needtheBluetooth.
Intel couldn't figure out this during one and a half years? :O