I don't know what a GDI is.. okay, you can laugh... but I do know how to check my resources... they do not seem to change more than a few percent... I am running vue 3.1 on an athlon and it is rock steady, and renders VERY FAST no matter how many models and stuff I put in there... it is a wonder to me, and much faster than bryce 4!! (when I very frist got 3.1, I wanted to test it, so I loaded a bunch of copies of my vista models, and a bunch of trees, and terrains, just to see what would happen!) Oh, I tried it at final and broadcast render settings. I do not know about vue 4... all the comments on the problems have me waiting and watching... (and saving my money for later when it is resolved or a patch is posted) Sara