As far as I'm aware, the openGL only "improves" the display of Vue when your working on the image - it doesn't help the render at all. I use a P4 2.8GHz with 1 Gig Ram and Geforce 4200ti 128MB card - major problems with openGL; I only use it for fine placement of objects, if at all. 4.2 patch totally locked up Vue, so went back to 4.12.