My gosh... this worked! I had inconsistent frame rates, sometimes it would be very jerky and then smooth out after 30 minutes or so. When I logged on tonight, the performance was laggy. I remember this post, dug it up (not easy without a search function), looked at the helpful images posted by a couple of people, clicked a few things, and lo! instant smooth game. It may not help everyone, but it was useful for me. I vote "sticky" for this thread.