[nickoko]

FYI, I have the same problem (2009 GMC Acadia). Bluetooth worked fine for a while, then it started making things extremely slow. I saw this thread at that point and thought about experimenting with my pim.vol file, but decided to just do a hard reset.

At that point I re-synced with Outlook to get all of my contacts back, and everything was working fine - for a few weeks. I am now back to the extremely slow phone when connected to bluetooth in my car. I guess it is time for some troubleshooting.