One of our Windows 8.1 Enterprise laptops is used by a user with local admin rights. The problem the user faces is that when on a WiFi connection that isn't on the Domain, it behaves very slowly. As if trying to contact some domain server. As soon as the Wifi radio is turned off, everything returns to normal. When logging in the Wifi radio needs to be turned off or else the user is faced with a black screen for a couple of minutes. Simple task take a long time to open like Windows Explorer or Task Manager. If the VPN is turned on it also returns to normal.
I have tried to login as a local admin user and the same occurs.
Other users with the same laptop and configuration don't have this problem.