CADTutor.net is the fastest CAD forum I am aware of. The blasted Autodesk forums are so bloated and slow, and there is always something going on where you can't load photos, or the pages time out, or something.
It is a pleasure to come here and read or respond to a post and know that it just works, super fast on top of that.
Cheers to David and all of the members who make this place what it is.