Max 2015 viewport performance and back face Culling

Yes…I’m getting the performance lag in 2015 with regards to Editable Poly objects. As for the DirectX 11 option…the problem I’m having are brief moments of intermittent screen freezing, just for a split second when rotating around objects, panning etc. It’s feels like the video card is waiting for information but I do not have this problem with 9.