I'm really not sure what is up with those segfaults, but I know sluggish effects are being reported all over the place, and we have yet to figure out why (you have to remember, we already using a workaround, Compiz does not officially support these video cards). You mentioned in your first post that it said something about python openGL, do you still get that error? If so, where, can you show us the command/output?
Also, is your system fully updated? If you are unsure, run
sudo apt-get update
sudo apt-get upgrade