I use an Apple Magic Mouse 2 with my laptop when working from my home office. Lately I've run into some serious sluggishness, but it turns out there's a quick fix.
Fingers crossed 🤞 it works for others with similar problems.
The first lesson is to keep your mouse charged. Lots of reports of bad behavior relate to the device having a lower battery. Charge regularly and there's a good chance you'll be off to the races again.
From a Lifewire article I came across, there's also this:
There are a number of preference files related to the mouse that could be causing the problem. As a result, you can [...] get rid of all of them, and let your Mac rebuild the preferences.
The culprits we're looking for are located in your
~/Library/Preferences folder. You'll want to delete the following:
Reboot to rebuild them, and (hopefully!) enjoy a smooth and snappy magic mouse experience.
Again, more details at Lifewire for the curious.