I searched a lot for this, and I couldn't find anything. I have a 2008 iMac with a 3.06 ghz intel core 2 duo processor, 2gb of ram, i have snow leopard 10.6.2 and i have an nvidia geforce 8800 gs 512mb graphics card. when im playing games in crossover games, i have bad fps and i heaard that turning vertical sync off could help. how can i turn vertical sync off?