you'll want to disable the extra visual effects on your slaves as well, like the ghost effect, shadows, and screen glow. these can also hinder the performance. this hurt mine in dalaran alone running one account. i turned them off and my fps actually went up. this was with no one around mind you. so it's best to turn those off on all your accounts for better performance. make sure you set the fpsbk anywhere from 5 to 15 and the fpsmax to what ever you want, i set mine to 60. if you run keyclone, you can do this in the setup along with changing the affinity for each account. make sure each is on a separate core. on a quad, main on 0, slave 1 on 1, 2 on 2, and slaves 3&4 on 3. i'm on a duo, so i set mine to main on 0 and slaves 1-3 on 1, i'm only runnin 4 accounts for now. make sure your video card driver is up to date also. if it's nvidia, they released a beta patch recently for a broad range of cards that my laptop manufacturer didn't even let me download. not even windows update would grab it, so i had to get it manually. think it's helped my performance since. symlinking the data folder vs running one from each account folder can also benefit your performance and cause less wear and tear on your system. my cpu usage stays around 50% and still have about a gig of ram left. another thing, i keep all my slaves windows minimized when not accessing them. the size of each window may also eat up ram and performance, so shrink the slave's if your main doesn't die that often.

here's my system if you wanna know what i'm running on.

http://www.newegg.com/Product/Produc...82E16834115475