I have a Logitech LX8 laser. I called Logitech and they told me downgrade version. I did and still have some lagging. Have new cloth mouse pad also. This started to happen when I hooked up to dual monitors. I have a Sumsung tv/monitor 23″ That’s when I notice the problem.
— Imacer99
I'd call Logitech again. I'm sure the problem must be with their drivers. To prove it is not the dual monitors, just try removing a monitor temporarily to try it out.
I will do that on Saturday.