I have used the PLE versions of Vue before and didn't think of this, so thanks for the suggestion and the explanation. I'm away this week, but I'll give the PLE a try and post back - I can't afford to go back to the latest version of Infinite right now but I am interested to see what difference it will make. 

i7 5960X, 32GB RAM, GTX 1080Ti, GTX 980 Ti, Windows 10 Professional.  Running Daz Studio 4.11, Poser 11, Vue Inf 7, Photoshop CS4