"Saving for your mount"... haha wait until you start saving for your EPIC mount. The key is to farm and sell BoE blues on the AH. People these days will pay vastly inflated prices even for low-level blues to twink out their alts. The other way to make some gold is to find obscure ingredients that people need alot of, like Elemental Fire and Dreamfoil, which are used in Greater Fire Protection potions.

Anyway... I've never had performance issues at all really, and I'm on a Powerbook with 512 megs of RAM. Even in IF or MC or other places with lots going on, my FPS have been great.