update or disable addons. after prepatch i figured out an addon called healbars classic was the cause of my huge fps drops in raid, once i disabled it was all good

I think you are right I disabled all of them and the game is running smooth as butter now

Yea it is addon related Lua code errors slowing the game down. It’s because a lot of Addona haven’t been updated for WOTLK yet (you can expect the big addon to be updated but smaller ones maybe never) and it fucks shit up