FPS Issue

Hello guys , Recently 4-5 mates started playing here ,so they invited me and i was down for it , but i have a problem. I was playing MoP in ********* , 64bit client and it works perfectly with around 120-140 fps , I even have the new models . I downloaded Warmane's version 5.4.2 but i can barely get 30 fps with settings on LOW . So guys , can you help me ? I'm trying to solve my problem for 2 days now and i really want to be able to play normally with my friends

Run it clean, without addons first and see what happens.

No result . It still lags :/ I wonder of the realms will be updated to 5.4.8 any time soon , because that's the final patch of MoP