If you click on wow.exe
And then click Play.

At the B.net / Password screen, click on Options to the right.
Then click on video.
The top right (drop down box) is called Multisampling.
You'll want this set to the top option 1x.

Clicking on Effects, drag the slider bar all the way left (Low).

If you have software which virtualizes your configuration per character/account, increase view distance and particle density on the main.
It helps to know to move out of the puddle of roiling black stuff etc.

Okay out of it.