I was playing TrackMania Forever on my iMac dual 2.4GHz quite well. But after upgrading Crossover Games from 7.0 to 7.1, TrackMania is not longer playable. All the screens still load, in fact more since the on-network functions now work too. But the rending speed has plummeted and the graphics quality, especially of the car, has dived. It's so slow now that I can't really play the game.