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The wow engine is just bad that's all, the game used to run at 50fps 6 years ago and it still runs at 50fps now.
not in a firelands riad it does nto i defy you to prove it does, all you to do is scour the official blizard forums to tons of people running very high specs and still not getting above 15-20 fps in (25 man raids) as well as checking nvidia/ati forums.
And as for your statement of being 50fps 6 years ago i do not think so, have been playing wow since beta. its not badly coded, blizard tried to code it so even people whith not so good computers could play it. wich was a very good marketing strat to do, they are improving it now with direct x 11 ect but as i said very very few pcs will in a 25 man raid in firelands get over 20 fps