Please help

Before update i had low spec mode on and client close in game, with this it was completely playable. since update i get really bad fps drops/lag. i have now set all the in game options to lowest setting making everything look basic including turning eye candy off. i have changed windows settings to full performance so it looks like i am on win98 and i close any unneeded processes. still nothing works, game is completely unplayable, keeps freezing or i cant even set off abilities. What can i do?
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