I never upgraded from 9.12 HF, so I can't say. These (10.2) were supposed to improve performance. One thing I do that substantially improves performance (don't know why) is to go into the config files (in My Games folder) and set the game to start in Windowed mode. Then I manually put it into fullscreen (alt-enter) and the game runs great (and still looks great). No idea what this actually does or why it helps, but that's what I do whenever I play.