Hi there, to give you some context, I am using a 2020 Mac Mini M1 16GB RAM 512GB SSD running Big Sur 11.6. I am also using the MX Keys and MX Master 3.

The mouse has been very problematic since day one. If I use the Logitech Unifying Device the left/right click, pointer, and scroll wheel work fine but the back/forward, gesture buttons, and side scroll wheel lag pretty bad, they have 4-5 sec delays, and then just queue up whatever I did with the buttons and do everything at once when the mouse starts working again.

If I connect the mouse via Bluetooth, then the buttons work flawlessly but the pointer becomes laggy.

I have a Windows computer and tested the mouse with it and works fine through the unifying or BT.

Today I downloaded the Logi Options+ Beta software and the issues just disappeared, meaning that the problem was not my computer but the Logi software. Not sure what you guys are doing with this beta software but the mouse works fine now. I did notice that there is an almost unnoticeable delay when pressing the caps lock key on the MX Keys. I noticed it just because I type very fast and my fingers are faster than the keyboard. This did not happen using the non-beta version of Logi Options.