I ran with a GeForce 8600M GT, 3.5GB RAM @ 667MHz, Core 2 Duo 7250 @ 2.0GHz, all low, 1024x1280 at 30 FPS except in WvW.
This is an almost 6 years old laptop.
Needless to say, I think some of you just don't know how to maintain your computer. To the guy being impressed that 4 windows of WoW only use 4% of his CPU: that's cause you're not actually playing them simultaneously. If you were raiding on all 4 at the same time and continuously you'd see a significant jump in processing usage.
The game probably still is unoptimized, but some of you also don't know how to set your settings from the video card's control panel, don't defragment, your computer's full of junk processes like automatic updates, drivers not up to date etc.