Mouse cursor lags with external monitor

For me it works to unplug the external screen (I only use an external screen) and plug it in again. No more cursor lag.

Hello,

I have the same problem with my mouse on my late 2014 MBP. Must mention that my mouse is not a BT mouse, but a wifi Asus model.

I solved the lag problem by understanding first the issue. I didn't thought for a second that a lagging mouse problem can be linked to transparency of the background for example..like I saw in other cases.. or modifying other type of settings. It just didn't make any sense and it also seemed batshit crazy to me to think so. It's like changing a wireless router signal problem by repainting the walls in another color.

So my thought was what if my monitor(which is a Phillips and not a Dell like in most cases) is making some sort of antenna with it's HDMI cable and the thunderbolt HDMI adaptor, that blocks or interfere with my mouse wifi signal.

So all I did was to wrap some aluminum foil on the HDMI connection from the monitor with the HDMI connection from the thunderbolt adaptor. It all worked well. And just to make sure that this was the problem, I've taken down the foil to see if the lagging appears again, and it did, just seconds after the removal of the foil. Put the foil back and it disappeared.

So until it will start lagging again, and I surely hope it will not, I'm sticking my guns to a more realistic approach than changing background transparencies like I've saw on other cases.. 🙂

I'm sticking to this theory for now and I hope it would solve your/others problem too.

Cheers!

Man thank you for this so much.

I was just about to return a great display as I couldn't handle the lag. This resolved it ALL!

This one works like magic. Though Apple should fix the issue so that we don't have to use such tricks.

Wrapping the display cable in tinfoil fixes this issue.

With all of the tech, this just blows my mind. Tin foil. It actually makes sense - however this means if you had a USB cabled mouse, it would work perfectly right?

Absolutely same problem... Dell mouse... it's working on EVERY different device, BUT MBP.
<irony>Well, I'm so lucky, that MBP is so cheap... </irony>

I can confirm that this was exactly the cause of the issue when i was experiencing it. Moving the dongle from the HDMI side to the opposite side fixed it instantly.

Just to note i was using an usb hub beside the HDMI port. Which was interfering with my magic mouse 2.

Another way i found working was to wrap tinfoil around the connectors. it works well.

Confirm from my side as well. Moving infra-red receiver for my wireless mouse to another side of Mac from HDMI cable solve the mouse freezing!

I had this same problem on my macbook pro 2017 w/ touch bar and was able to solve it simple by connecting to usb-c ports on the other side of the laptop... weird.

Incredible, 5 years later, brand new Macbook, same issue, same solution.

Thanks, Kraasa

I had the lag too; When I moved the hdmi hub away from the power outlet and away from any other adapter, lag has stopped