CorelDraw X7 (17.4.0.887) and 4K 3840x2160 (60Hz) Display lag? GTX 970 SSC

I've had this X7 laying around here for a good while now.

Finally upgraded from X5 (32 bit on Windows 8.1 Pro 64 bit, yes it worked JUST FINE except CorelCapture).  Very fast on typical 1080p displays.

Upgraded from (2) 23" 1080p Dell displays to (2) 27" Dell P2715Q (60Hz) (3840x2160) displays with a new Geforce GTX970 4GB SSC GPU.  Intel i7-3820 3.60 GHz. 64GB RAM

It's not terribly bad, the lag I have using CorelDraw X7 now after the upgrade, but it is noticeable and feels like it slows me down now.  : /

Anyone else experiencing this lag in CorelDraw X7?  I am guessing it's the extra overhead required to push / refresh these 4K displays...so much more rasterizing of the pixels/displays probably.  The GTX 970 is a very powerful video card though.  Went from GTX 660 3Gb to this...and it just may be the cost of going from 1080p to 4K.  Obviously works fine with Adobe CS6 and Autodesk software.

PS...  after upgrading to 4K and before upgrading to X7, X5 would BOMB when zooming in far or overloading it by panning or zooming...  just FYI only...I know X5 isn't for Windows 8.  But it has worked for me ever since Windows has been out...  and much faster than the 4K setup and X7.  but it does NOT work with a 4K and/or GTX 970 setup.  SO yes, I upgraded to X7 and so far, knock on wood, X7 hasn't bombed/crashed with excessive zooming, panning, etc etc.