No idea. The mod is optimised for performance, as I'm developing it on a laptop, with a crappy onboard graphics card. On my 5 year old desktop I get a solid 60fps with all settings on high. Turn of AA, and set all graphics settings to low, and see if that improves your framerate. If it does, then you just need to systematically turn each graphic setting up until you find out which one is causing the lag. In particular, you might want to set particle effects and projectiles to medium or low, and turn character shadows off.
Maddieman
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