Game insane FPS drops

The search function of this forum apparently dosn't work so i don't know if this been posted before.

I've installed the game yesterday, and i already there noticed some small FPS drops, i tried to set my video setting to see if this could fix the problem but it didnt help, the fps was so minor that i continued playing.

When i reached lvl 20 i started heading to orgrimmar, and as soon i stepped inside orgrimmar my FPS drops INSANELY low 5-6 if not freezes, i can't get my char out of orgrimmar now because of the lag. Anyone experienced anything like this? my computer is only 1 year old, and is a solid computer with semi high class spec like 970 gtx 16 gb ram ssd etc. And it has NO other lag issues in other games so i am assuming that it's the client. Anyone got a fix?

best

Ragnhilldr

Are you using the client modified with WoD textures?

Yes i am, is it possible to get a non version of this?

Yes, you can get with "Wrath of The Lich King (old)" client.

http://i.imgur.com/PTofGKS.png

I've tried install the old school, in the beginning it helped, but now the lag is back again... Hmmm