I think it's just the programming of the games. The early G+ deluxe, if you have the progressives turned on and they are both swirling (like they are almost ready to hit), the frame rate drops tremendously! Get a bonus and it's even worse. Once the progressives hit and they stop swirling, the frame rate returns to normal. For Kronos, I have the newer 512mb version of the game, and it doesn't seem to happen... like they improved it or something. I would love to find the 512 versions of Vampires Embrace and Queen of the Wild as those seem to have the worst frame rate drop issues.