I'm having a similar problem -- whenever I log in, I get a framerate of about one frame per second, at most. I've cleared the overrides, done two reinstalls, and re-downloaded both the CEP and POTM haks. Nothing solves it.
Plus, it's only POTM that does this. Other PWs, the NWN campaigns, and even a custom module made using the hak order from the Item Request Thread all run fine, but POTM runs like pitch through a funnel.