The change is needed in the operating system kernel mode graphics driver. Microsoft is looking into scheduling this development. In the meantime, provided you have purchased a platform allowing you to, the workaround is to disable the low end GPU so Windows uses the only one left. Today, Windows will always use the POST graphics card.Jesse James commented
Since update KB3176936 I'm experiencing similar problems.
When I want to use an applictation that requires my Nvidia GPU I have to remove the HDMI from the Port Replicator otherwise I have extreme performance issues. So I plug my HDMI straight into my laptop (beats the purpose of the Port Replicator ofcourse).
It seems DisplayLinkManager prevents my laptop from choosing the right GPU (Nvidia GPU). I've tried everything, manually forcing to use, global settings use Nvidia GPU, re-install, update Nvidia Control Panel/GeForce.
I'm using a MSI PE60 2QE, with a GTX960M and Intel HD Grapichs 4600. (For reference)
Problem really seems to be with the DisplayLinkManager software.
Hope you bring out an update soon!
Thanks in advance.