Sorry for a late response, sorry for a duped post (webpage froze).
Heres the things,
I run the game completely fine in Single Player, Ultra Settings, No Lag, No Problems.
Now, when i start the mod, the introduction, loading screen, menu, everything is in 25ish fps, including my mouse movement. I have already tried lowering the settings to rock bottom, and saw no improvement. ive checked my Nvidia settings to see if maybe the game is running on my CPU, and there was no problems there.
Give me a few, ill try unchecking development logging.