This issue has been discussed in MANY forums and threads out there, but no answer. I studied the possibilities and found some stuff. Before that, lets see the previous situation: -Logitech M555b ONLY. Status: no lag, no problem. Mouse used to stand in the right side of macbook. Macbook: high stand (about 25cm elevated - griffin). Now, the situation, WITH the bluetooth lag: -Bought an Apple Wireless keyboard Macbook: same height but now I put it on my left side. Status: lag on bluetooth logitech mouse. Jumpy cursor and delay on the movements. What I did and DIDNT solve: -New batteries; -New mousepad; -Opened the mouse and cleaned with cottom; -Formated and did a fresh install of Snow Leopard (last update); -Changed 2.4ghz router's channel to 1, 2, 3, 4...until 11. (D-524 DLink); What I noticed: If I use ONLY the mouse, everything is ok, but when I add the Apple bluetooth keyboard, the mouse gets laggy. It seems that the bluetooth sensor in macbook pro doesnt have that much power to handle these two devices. What I am going to do next week: -Install a new router (Cisco E2000) and use the 5ghz signal; -Use my macbook pro in the right side (so the mouse will be closer to it). Does anybody have a solution?