Well this sucks. Throughout my house I typically get 55 to 60 mbps download speeds on my wifi network. Up until I did the Windows 8.1 update my SP was getting 55 to 60 as well. Now after the update I am getting 18 to 25 :-( Every other PC in the house is still getting 55 to 60. If I plug a D-Link USB wifi adapter unto my SP I get 55 to 60 again so it is definitely the Marvell Adapter that is messed up. So, the Windows 8.1 update somehow murdered my Marvell (POS) Adapter. I tried uninstalling it and flashed the latest release from Marvell themselves. A little better but still terrible. Any ideas?