If you are still having the issue I have something you can try.

Even after getting latest launcher/updates/windows drivers etc....

Turn down the view distance to at least half in your settings. I have not had a problem since

You do realize that the Admins of this server did not write the code for WoW right? They do not alter graphics. The graphic art was done by blizzard and is in no way shape or form something that WoW-Mania is going to user their time and/or resource. Seeing as this is a Blizz-like server, that means ...