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.

Hi,

According to your description, this problem seems like caused by WIFI connection. You can try to reinstall Wireless Card driver for test to fix this problem.

If no use, when this problem occurs, open Task Manager to check which process is occupying a plenty of CPU or RAM resource. Then end the process for test.

I uninstalled the driver and installed from the manufacturer's web site. It behaves the same. When the process halts it isn't eating any CPU process, it just halts.

Which process halts?

Whatever I try to open. For example if i try to go to C:\ in Windows Explorer, well Windows Explorer halts.