I should protect myself. I know this works for my 3150, but I don't have a drop down menu for my dpi settings like the new machines. I have to change the dpi, which I never do, by doing a linux command. On my 1224 HDC, I have a drop down menu but I never have to change it. I run everything at 1200 x 480. It doesn't make a bit a difference in speed if I run at a lower or higher resolution. Let us know if this works on your 3150x2 since you're changing DPI alot.