Crash + lag

hey guys, as much as I love this mod/game, I have started to get fed up with it.

I recently downloaded v1.0, and i have a few issues with it.

On single layer (Co-op), I get major lag/low FPS when i go into the heart of the maps.

Also, just today, after it finished updating (Said it needed to install update before i can play), it has crashed right after i have loaded the map.

Getting pretty annoying now as it takes me a long time to load maps.

Thanks, Pat.