IsBoxer: Slave windows or video FX panels are choppy 7-10fps)

[Slayde]

I'm running windows 10 with an Nvidia Geforce 780 GTX video card. For some reason, WoW always throttles down to very low FPS when the window is not the active window. Main window can be running at 70 fps and instant swapping is lightning fast and smooth. Does WoW have a setting for a minimum background FPS to keep it from dropping so low?

This happens even if I'm just running a single slave and have that background window displayed in a video FX panel or on my 2nd monitor. Anyone else experience this same issue? This makes it worthless to do anything but stack them all on a single panel due to how distracting the video lag is.

FYI, Doesn't seem to matter how low I change the wow settings on each client. The background windows always run at a max 10 fps.