(READ THIS JIGGMIN)
The faster your game runs (the better your computer usually causes this), the more fps you get. The more fps you get, the faster you do EVERYTHING while racing (running, jumping, falling, accelerating) except for the usage of items. You should fix it so everyone gets the same performance and can race at the same speed. I haven't lost more than 5 races since I upgraded to firefox 3 because it boosted my performance.