Mario Kart Wii problems

[babeldude]

My cpu temperature seems to stay about between 30-35 degrees so it is not overheating. I think it is a matter if how many things are going on on the screen it is also very audio related. In a time trial for example, everything is running fine with no slowdown but in a grand prix, the audio stutters and the game with it. It is more present when multiple characters are on screen and they all make their own sounds.