Mouse stutter El Capitan

[paradium]

PROBLEM: My cursor freezes every second for about a quarter second when moving any mouse and the top 20 hits in searches for "capitan mouse freeze" have not given effective advice.


BACKSTORY: Magic Mouse (v1) had been running flawlessly on my 2014 iMac until I installed the latest El Capitan 10.11.6 security patch (2017-001) and rebooted this morning.

Freeze happens with my Magic Mouse (1) via Bluetooth AND ALSO with my wired Logitech mouse with Bluetooth is disabled, or all combinations tried. All other Bluetooth devices are disconnected, USB mouse was plugged in through wired keyboard connected directly to iMac with no other USB devices connected.

During freeze, bluetooth mouse halts and recovers near the freeze spot, however USB mouse jumps leagues across screen ~ very difficult to use.


ATTEMPTED:
* I have removed Magic Mouse preferences and rebooted
* uninstalled Logitech control panel
* toggled MagicPrefs on and off
* removed Magic Mouse pairing, and re-paired


The freeze only happens on mouse movement, and scrolling does not seem to be affected.

Activity Monitor shows nominal CPU usage, nothing out of the ordinary.

 

[DeltaMac]

What happens with the CPU graph in your Activity Monitor, when you move the mouse?
If you click the top of the column %CPU, it can sort the highest CPU usage to the top of the list.
Do you see sudden changes in that list when you move the mouse?

Also, did you try plugging the USB mouse directly into a USB port on the iMac?

 

[paradium]

Nothing out of the ordinary in CPU usage, USB mouse direct, yes.

 

[paradium]

SOLVED: Having a 2nd monitor connected (HDMI projector) but turned off is the cause.

Turning on the screen fixed the cursor.

Other forums have described this problem and solution, but this was not a problem before the Security Update 2017-001.

 

[DeltaMac]

Have you tried logging out, then logging in to another user account?
If you have just one account, this might be a good time to make a new account (in your Users & Groups pref pane), just for troubleshooting your mouse issue.

I see that you mentioned a projector.
I didn't think about that, but have heard about that.
I wonder if a different adapter could be a fix, too?
Are you using a one-piece cable (no adapter) such as this

 

[paradium]

In this particular case I am using an OWC Thunderbolt 2 dock, HDMI to a splitter then to projector.

System works fine, love this dock! Projector is off now, and mouse still functions correctly, so it's just an order cycling issue I'll work out another time.

Thanks for the input, Delta. Hopefully this helps the next frustrated mouser.

 

[Dexfx]

SOLVED: Having a 2nd monitor connected (HDMI projector) but turned off is the cause.

Turning on the screen fixed the cursor.

Other forums have described this problem and solution, but this was not a problem before the Security Update 2017-001.

Bruhh.. you just saved my life! Wow i was at the point i lost all hopes to fix te issue i was goin crazy for a sec. made an account just to lyk and thank you

 

[benjobe2513]

I had the same problem. Thanks for sharing your solution. It worked for me. This is why the internet is awesome.