Try this:
Using this I have eliminated most lag and FPS problems. My average stats before was 70-90 FPS in sanc, 20-30 FPS in big battles, 5.0% packet loss and 70 ping. Now I get 160-200 FPS in sanc, 60-80 FPS in big battles, 0.0% packet loss and 30-50 ping. And i get no more of that anoying projectile lag. Also faster cont load times, and mo more mouse lag! Hope this helps you! By the way, I run on Win XP pro.