Hi Marco, those settings make the video driver or MoI make use of multiple CPU cores to do some portion of the display work. But using multiple cores is an inherently difficult thing to make work properly, every thread that might access the same memory has to be synchronized with each other. In some versions of the nVidia display driver this has been buggy so if there is any odd display behavior it can be good to try turning off that option in the nVidia driver. There will be some performance cost to that, it's hard to say how much exactly it's going to be system specific.

- Michael