Bluetooth Magic Mouse lag / stutter .. , Apple Keyboard lag / stutter

Thank you for posting your solution. It has helped for me. I have a MacBook Retina, 12", Early 2016 withSierra 10.12.3 and had the same problem. My mouse lag and stuttering is resolved simply by removing and reinstalling the same batteries in my keyboard. Thank you again!

Reminds me of the old medical maxim: if a problem has one solution, it works. If it has many, none of them work.

I've been battling with this issue intermittently for some weeks. Mouse stutter alone is extremely frustrating, but intermittently behaviour makes it even worse.

Like others, I found that turning Handover on/off, WiFi on/off, rebooting, remove the mouse and re-pairing, all seemed to "work", for a little while. Next time I reconnect - same issue appears and none of the previous "solutions" are effective.

But I think you might be on to the root cause: the DisplayPort!

I have a MacBook Pro (Retina, 13", Early 2015). There are two DisplayPort/Thunderbird ports near the MagSafe port on the left side. By default I plug an external monitor into the rear most, then turn on the mouse, and it stutters terribly.

After trying everything else, I tried unplugging the external monitor - bingo, no more stutter. I then tried plugging the monitor in to the other port. The mouse went stutter, stutter, perfect!

That's some pretty good evidence that all this Bluetooth mouse stutter drama might be related to other things plugged into the Thunderbird ports. Keen to hear other's experiences.

For those who may have the specific setup that I have, this is fixed by not using displayport to HDMI, but rather displayport adapter to either VGA or DVI.

And to those defending Apple on this and buying new hardware, sorry, but this is a fault of the system resources management that is in OSX, not the mouse or wireless frequency, etc, don't kid yourselves.

Thanks to @Christzsun. This fixed it for me too. I removed a USB hub from one side of my MacBook Pro and plugged it in on the other side. I also noticed some behaviour changes to the mouse depending on if I plugged the USB hub in BEFORE or AFTER the magic mouse had connected (Bluetooth), but it was sporadic.

Might or might not help, but I would reset the PRAM and SMC.

Barry

I have this same issue. I reset both the PRAM (NVRAM) and SMC and it appears to have worked.

I will report back if the problem appears again.

2 hours later and the problem has arisen yet again. It seems to happen only after I have opened Safari and/or iMessage. Closing them both helps, but makes my computer much less useful.

Praying that an OS X update fixes this.

I'm seriously about to flip out if Apple doesn't at least recognize this as an issue soon.

I'm not positive if this will fix our problem, but it seems to be working for me for now.

Go to System Preferences/General and uncheck "allow handoff between this mac and your icloud devices".

My guess (just a guess) is that Handoff is messing with Bluetooth and causing interruptions with Bluetooth connected devices like mice and keyboards. I came to this conclusion because anytime my mouse lags or disconnects, it's while I'm using Safari, Messages or Mail, all Handoff-capable applications.

Please confirm if this works for you (until Apple releases a fix)