I've been playing this for months on my 32bit laptop, and it ran great ... 30+ FPS triple digit ping usually.
The laptop has integrated graphics even.
I've recently set up my desktop ... which has much better hardware and an Nvidia graphics card, as well am running directly connected cable connection that is consistently 60mbps on avg.
I updated my graphics card driver, updated DirectX and when I fired up WoW, in settings did the automatic settings in graphics and it said "good to go".
In game, as you can see in the screenshots I took, all is not good to go with FPS around 15.
Any input is greatly appreciated ... as this is driving me nuts, and cannot figure how a 32bit system on wi-fi runs this better than a 64bit system hard-wired.