Posted on apple forums too. want to maximize my possibilities for help. thanks for your input! Hey folks. I have the 2006 version of the mac pro, and I have a Kensington Si670m bluetooth mouse. it's basically unusable because of the excessive amount of lag. the mouse just lags like crazy all the time. do you think this is an issue with the mouse? or with the bluetooth in my computer? i don't really know anyone else who uses a BT mouse to help me diagnose the problem, but the mouse works perfectly with my macbook... just doesn't work worth a crap with the mac pro. any help is MUCH appreciated! I paid like $50 for the mouse, i want to use the darn thing!