Magic mouse 2 lag after upgrading to macOS X Big Sur.

I wonder whether your keyboard stops and you get a sound like a key is stuck. This is what I have found from time to time.

Restarted and problem has gone away - perhaps for a day or two, then repeats.

I moved files away, but no improvement in response.

I was recommended to do a restart for change to take affect.

However, post restart, these files magically re-appear back so not sure how to apply this workaround so it sticks.

Hi There, hope this message finds you well...

I did everything also, and magic mouse still in troubles!

As mentioned, i´m happy with the computer, but I already bought an additional logitec mouse and keyboard combo.

and I like a lot the center wheel which is made of metal, and you can scroll hundreds of lines in seconds and stop it right where you wish (this is not possible to do w magic mouse)

Regards

• I tried your suggestions, no luck. Just to clarify, the mouse was working perfectly fine until the last update of Big Sur, on my mac mini (late 2014 model - connected by ethernet). Just to rule out the mouse/optical sensor etc. I tried it on another mac (MacBook pro 2019 using Catalina), with no problems. Others agreed with you about interference of some sort, so I did try your suggestions. Also all 4 usb ports are empty. I disconnected my bluetooth apple keyboard, I removed the files com.apple.AppleMultitouchMouse.plist 
• com.apple.driver.AppleBluetoothMultitouch.mouse.plist 

Checked the track speed, Tried in safe mode. Called Apple support twice.

The only thing that worked was to throw the $80.00 magic mouse in the drawer, and dust off the old HP wired mouse that is lightening fast..Ugh More suggestions are appreciated.

I tried several other solutions to this problem (Magic Mouse 2, with Big Sure upgrade) and deleting the preferences suggestion above worked. Thanks.

Same here. I cant find the preferences files that some other refer to. Super annoying.

Those files are located here:

By default that library is invisible. Go to your Home folder, then to the View ➙ Show View Options and check this checkbox:

It will then be visible in your Home folder.

This seems to have worked for me, so thanks, but I'd sure love to know why it worked if you have anything to add.

Deleting these preferences worked for me too. Thanks @maartenwilbers

I, too have tried all of the above, and have called Apple support twice. Did you ever find a fix?

We are fellow users, so cannot provide a fix, and Apple product teams do not participate in these public communities. You can however, provide constructive feedback to the Magic Mouse product team.

As with any bluetooth device, you need to be aware that interference from same frequency, proximal devices (e.g. cell phones, other bluetooth peripherals, etc.) can interfere with the Magic Mouse 2. A low battery condition will also have an impact on its usability, and connection durability.