To answer my own question, it seems this option controls the use of quick and dirty optimized raster ops. On Mon, 2003-05-12 at 12:16, Mike Hearn wrote: > Can anybody explain what this option does? I'm trying to solve a bug > where a BitBlt and a PatBlt seem to race each other for control of the > screen, and am wondering if this might affect timing. > > thanks -mike