Originally Posted by ForeverTheGM
WoW has had multi-core optimization since Wrath of the Lich King, but it wasn't used unless you enabled it through CVar's. Cataclysm will now use your extra cores by default.
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Interesting... What in the heck are CVar's???
Said question probably being a pretty good clue that I had no idea multi-core support was included with WotLK.