I have a mid-2014 MBP retina that runs OSX El Capitan (10.11.6). I'm trying to use my wireless Logitech mouse (Anywhere MX, the first edition), but there is an intermittent lag problem. Sometimes it lags so much that the cursor does not move smoothly across the screen. There doesn't seem to be a particular app that's running that causes it. Here's what I know:
I suspect the mouse isn't the problem because the issue repeats with another wireless Logitech mouse.
When I switch to an old wired mouse, the problem disappears.
A reboot sometimes works.
I did not observe a particular trend in memory usage while this happens. In other words, the rest of the system functions ok. The trackpad works fine.
How can I diagnose the problem?