Hello, I received my MBP 15" (Mid 2012) several days ago. But my Magic Mouse doesn't work very well with it. The cursor lags every several minutes to one hour or two, and lasts for several seconds to several minutes every time. I don't mean that the movement is slow - when it happens, the cursor doesn't follow the movement of the mouse timely, or it doesn't response to the mouse at all. The cursor may "jump" to the destination 0.3~1 second after I moving the mouse. I tried everything I can do but the problem is still not solved. Here are what I've tried: * Turn the mouse off and on. * Turn the mouse off, replace the batteries to new ones, and turn on. * Restart the computer. * Remove the mouse from the list of Bluetooth devices, and pair again. * Reset PRAM and SMC. * Disable WIFI. * Unplug everything in my room that has a wireless receiver, including Xbox, Apple TV, etc, and remove the batteries of their controllers. None of the above works! However, I also have a Magic Trackpad which also uses Bluetooth but it works fine. I tested the Magic Mouse on my old MacBook Pro and it works without any problem. The distance between the mouse and the laptop is less than 2ft. I've been struggling with this problem for several days. I am about to get a Logitech mouse. Does anyone has any ideas? Thanks a million!!