...if the OS hogs so much resources that you can't work any faster? The only things you see real improvements in speed wind up being older programs that are not designed for the higher clock speeds. Like trying to drag fill in Excel and the screen scrolls so fast you wind up playing yoyo going from the top of the file to the bottom and back. But try to do anything computer intensive, or multitasking, and you are faced with hangups, blank windows, etc. That is my experience with other Windows upgrades.