Some of you may have experienced what I have experienced.
You're running MTM2, and you click "race" and when the race starts, it seems like you're getting about 10 FPS.
However, when this happened to me, I checked the FPS and it was about 30, which it always is for me.
It only does this on custom tracks. Stock tracks are fine.
As far as I know, the only fix to this problem is to delete MONSTER.INI and stay away from playing MTM2 for a few days. If you can't stand doing this, then make a truck or two while you wait.