Mouse cursor lags with external monitor

Same problem. Late 2013 Retina MBP. Dell UZ2215H external monitor connected through Thunderbolt hub.

Problem does not occur when using the magic trackpad directly with the laptop.

Apple just replaced the wireless card on my laptop -- and it made no difference.

I had the same issue where after every 5 - 7 seconds the mouse cursor will freeze for a second before continuing. I am using Apple Magic mouse so no external mouse dongle. The only thing plugged into my USB port of the other side (Left side) is a 128GB flash drive. I have an Early 2015 13" Macbook Pro. The external monitor is Samsung SyncMaster S24B300 connected via HDMI.

The way I resolved this issue was to Change the refresh rate of external monitor from 60 Hertz (NTSC) which was selected as default to 50 Hertz (PAL) which it should be for EU region. The rest of the settings are Scaled to 1080p and standard Rotation with under-scan off.

Hope this helps.

Hi all,

I have had the exactly the same issue and I have changed the mouse usb to the other side of my lap top and the problem has gone!

same here, every 5-7 seconds, the mouse (or more or less whole OS) hangs for a couple of seconds. My set up:

2015 13inch rMBP, El Capitan 10.11.3

Dell U2414H on HDMI, NTSC

The thing is it only hangs if the monitor is switched to an input other than the macbook...

I had the exact same issue with f.flux. Basically having f.lux opened and a second monitor connected caused regular short (few seconds) lags/freezes. Disabling f.lux or disconnecting the monitor fixes the issue. I haven't fiddled with refresh rate though.

I upgraded to the Apple Magic Mouse 2 & have not noticed the problem since. I have 2010 MBP w/El Cap & 2010 NEC 24" external display.

Im just wondering are you guys using a thunderbolt adapter? I realized when I was using a thunderbolt to DVI adapter i would have the lag problems with the mouse and anything I did on the laptop would lag. I was using some cheap adapter I found on amazon and ended up replacing it to apples adapters and the lag went away. I have 2 external 27'' monitors connected to my mac book 2013 late model and no more lag. So im thinking if you guys are using some cheap thunderbolt to hdmi or thunderbolt to dvi adapter

Yes I am using and when I changed the usb for the opposite side of HDMI port it worked perfectly.

I always use usb port on the opposite side of HDMI port and still have this issue from Mavericks. I have this issue with bluetooth mice, wireless mice, and also wired mice. I'm struggling with this issue since the moment I bought a monitor for my macbook. I have reported this issue several time, no response received. And also have no fix for it in these years. I'm really tired of these issues

PS. macbook 13 Retina (mid 2014)

I too have faced this issue (occasional stuttering of input devices when external monitor connected), ever since the days of Mavericks. I can't claim to have a certain fix for it, or even be sure of what's causing it, but this is my theory.

The problem is due to the electrical interface between the monitor and the HDMI port. I believe this because it doesn't happen with every monitor, and I also suspect there may be grounding issues with my monitor. Perhaps it's a fundamental chipset incompatibility, I have no idea (the console log gives no clues). The only way I have found to mitigate this, although this may be coincidental, is to make the connection more secure for the plug on the Mac side of the cable. In my case the weight of the cable is pulling down on the plug, making it angle slightly upward, and perhaps causing a less secure connection for all of the pins. I have placed a piece of cardboard under the plug, thick enough that the plug can only enter horizontally. Whilst I do occasionally do encounter lag, I can now go many days without any problems, and in my case the connection still could be more secure, as it moves too far laterally for my comfort.

I would suggest improvising a way to make the connection as secure as possible, and, if after a few days the incident rate falls, then my suggestions would be

• As short an HDMI cable as is necessary. The longer the cable, the more chance of issues.
• A better cable. My cable was the cheapest eBay cable I could find, and whilst it appears to work, the connection doesn't feel as secure as I imagine it should be.

I should also add that when it does start lagging, you can reset the interface by opening the Displays panel in System Preferences. If more than one refresh rate is available, toggle that. If not, rotate the screen (then immediately revert it). It may require more than one application.

Hi guys,

I'm having the same issue as most of you. Searching about it I got in this thread.

I have a MacBook Pro (Retina, 15-inch, Mid 2014) with GeForce GT 750M 2048 and a Samsung LU28E590 4K monitor. I tried a lot of solutions described here. If I work with the mac screen opened the issue goes away (I would prefer to work just with the monitor). My issue is with magic mouse one. I tried with a logitech and it happens too. I have a magic trackpad and it works fine.

I was wondering if with magic mouse 2 the problem goes away.

Anyone got a definitely solution?

I moved my usb wireless adaptor to the other side of my 2013 macbook pro (away from the HDMI port) and the problem was instantly fixed.

this worked for me. Thanks!

This seems to have been my issue as well. I had an XLR audio cable sitting next to it, the hdmi cable was loose and a usb cable overlaying it. I fixed the connection and moved the other cables away and that seems to have fixed the issue.

I've also got this same problem in my new Macbook Pro 15'' 2015 model. I'm using an LG Full HD 24'' monitor. Yesterday when I first connected the monitor it happened for a while and then it seemed to have gone away. Now it seems to be doing the same again. I think if I plug and unplug the monitor it will sometimes go away and other times it will happen. I'm not sure if there's any actual pattern to it.