I have a weird issue that makes my Magic Mouse 2 usage experience very uncomfortable on iMac 27.

The problem is: when I move the mouse vertically (up or down), tracking works very slow. That is: I have to raise and move my mouse 3-4 times to reach the bottom of the screen (assuming I started from the very top).

On the other hand, moving in a horizontal direction with the same speed works like a charm.

OS X Sierra, tracking speed is set to maximum and no third party applications used.

Is there a way to fix this?

  • 1
    Have you tried another mouse, or tested that one on another computer?
    – Tetsujin
    Jan 8, 2017 at 11:06
  • I have tested it on Windows 10 laptop and it worked like a charm. Even on Windows it works better. Jan 15, 2017 at 12:01

1 Answer 1


researching internet a minute ago with the exact same problem in the same hardware - iMac 27 late 2015 + Magic Mouse 2 I found the answer that solved my problem - just blew the optics's and vertical tracking speed is ok again. I should use an air compressed can but used my lungs instead but away from the mouse to avoid humidity as much as possible.it worked for me.

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