Resolve 12 beta, laggy power windows

I'm experiencing substantial lag when drawing power curve Windows. When drawing my rotoshape there's a .5-1 second delay between clicking on the viewer and seeing a result. Moving power Windows that are built shows the same symptom. Click with mouse and drag PW, 1 sec delay until the shape moves.

Downgrading back to version 11.3.1 got everything back to instant responsivness.

What operating system? How much RAM? Which GPUs? What are the source files?

I have no problems with any Power Window issues on a 2013 nMP with 16GB of RAM and dual D700s, OSX 10.10.3.

Yeah...I don't know why I didn't include this info.....

Runing Linux centOS 6.6
Supermicro 7046 gt trf
3 gtx titans (original 6gb version)
quadro K600 gui
48 gb system ram
Nvidia driver 346.59
Decklink sdi 4k
Decklink driver 10.3.5

Source media is HD 1920X1080 DnxHD

No issues with the power Windows after reverting back to 11.3.1

[Peter Chamberlain]

As an idea.
Try removing the K600 and using one of the Titans for UI and see if that improves.. If it does then you can make a decision whether to share UI for image processing or buy another UI card.