i had other network problems, such as when i used a bit torent client, that needed to use a port in my modem, i would get cpu surges, but then i used a different network card.
my downloads are normal speed, and everything else seems fine.
and at the moment iv only noticed it when i am copying files, however i installed oblivion the other day, and it took ages, like it took longer then my friend 3.0ghz pentium (alot longer) when my cpu was clocked at 2676mhz