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BigMcGuire

Contributor
Original poster
Jan 10, 2012
7,195
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the Alpha Quadrant
2017 MBP 13' TB

I think I'm experiencing this problem: https://discussions.apple.com/thread/5478231?page=13 - Mouse cursor lags with external monitors.

I'm using Anker USB C docks to HDMI out to 2 1080p monitors. https://www.amazon.com/Anker-Adapte...er+USB+C+dock&qid=1566323715&s=gateway&sr=8-3 I have an external drive and a few other minor USB devices plugged in.

I noticed that mouse lag is a real problem sometimes. A combination of unplugging the docks and switching them from one side to another results in no mouse lag. This mouse lag is happens on the laptop's touchpad, a bluetooth mouse, or a wired gaming mouse. It is independent of CPU utilization. Once it happens, disconnecting the USB C dock is the only thing that fixes it.

When I walk away from my laptop and do a CTRL Command Q and log back in - I have mouse lag until I disconnect the right Anker USB C dock and plug it back in every time. Sometimes I have to do this several times to get rid of the mouse lag.

Plugging in external drives can cause the mouse lag to occur. So I really think it is related to the Anker USB C dock?

Do you think getting a straight USB C to HDMI cable would solve the mouse lag? https://www.amazon.com/uni-Thunderb...usb+c+to+HDMI&qid=1566323944&s=gateway&sr=8-3

I also noticed that these USB C docks get ... pretty hot. I have a pair of them at work and home so I don't think it is the dock. Pushing 2 1080p monitors shouldn't be that hard for this laptop.

My work bought one of those expensive 2 USB C port docks but it disconnects the HDMI monitor every 10 seconds and gets REALLY REALLY hot.

Any suggestions / recommendations welcomed.


Edit: Just tried triple shielded HDMI cables. Lag is still there. Starting to think it is the USB C Adapters (Anker).

OK it's the adapters. I'm certain of it now.
 
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BigMcGuire

Contributor
Original poster
Jan 10, 2012
7,195
8,828
the Alpha Quadrant
OK bought USB C to HDMI cables ($20 each) --- no lag. I'm suspecting that the Anker adapters don't like the Acer monitors I have = lag. Because at home with my Dell monitors, I don't have lag with the Anker adapters.

Case closed.
 
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jerryk

Contributor
Nov 3, 2011
6,742
3,660
SF Bay Area
OK bought USB C to HDMI cables ($20 each) --- no lag. I'm suspecting that the Anker adapters don't like the Acer monitors I have = lag. Because at home with my Dell monitors, I don't have lag with the Anker adapters.

Case closed.

Good to know. I don't see any lag with my Dell monitors with other adapters. Anker used to be my go to brand. But to be honest, there seem to be a lot of higher rated companies on Amazon.
 
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BigMcGuire

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Original poster
Jan 10, 2012
7,195
8,828
the Alpha Quadrant
OK.... last update I make on this.

The problem returned. The expensive $20 USB C to HDMI cables worked better and the problem doesn't return as often but it did.

I've narrowed it down to one of the ACER monitors I have at work. It ALWAYS happens on that one monitor - never happens on the other. Disconnecting/reconnecting it eventually fixes it until I put my laptop to sleep or it randomly starts up again.

This morning, I spent 5 mins unplugging/plugging into EVERY USB C port and the mouse would lag.

Note - the mouse lags even with the touchpad - so it's system wide. Unplug affected monitor - mouse smooths out and isn't laggy/skipping. Soon as you reconnect the monitor - mouse is laggy, jagged, etc...

I'm attributing it to the ACER monitor cuz this doesn't happen with any other monitor (Dells at home). Pulling the power out of the monitor and reconnecting power fixes it too (until it happens again). Something makes the Mac's mouse lag in relation to this monitor.
 
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alexlzl

macrumors newbie
Apr 14, 2020
1
1
My solution: "System Preferences" - Display - Resolution - Scaled. Try switch between the several options until the mouse lag issue is fixed.

I have been troubled by this issue for several months with my Macbook Pro (2015 and 2019 models) and external monitor (Dell U2718Q). Until one time I realized the mouse lag happened right after my Mac lost/forgot the external monitor's resolution scale setting. After switched between several options, the mouse returned to normal.
 
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BigMcGuire

Contributor
Original poster
Jan 10, 2012
7,195
8,828
the Alpha Quadrant
I forgot to update this! Wow.

What it was --- the cables I was using couldn't handle 60hz. Got some expensive USB C to HDMI cables and the issue went away. Sorry for not posting this earlier - completely forgot.

It is definitely related to the resolution and refresh rate.

The Anker USB C dock could only handle 30hz - not 60 for whatever reason (even though it said it could). Either that or it didn't like the Acer monitor.

New more expensive USB C to HDMI cables fixed the issue for me.
 
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praegustator

macrumors newbie
Dec 23, 2020
1
1
I am experiencing this issue with Baseus Hub, or Dock Station that connects to MacBook through USB-C. I tried different variations of cables and connections; once, it works as expected, but most of the time a mouse lags (as BorgCube mentioned, independent of CPU utilisation or mouse type, even on touchpad) and display shows no image. The only advice I found was to buy expensive cable or adapter, so I did and successfully connect one of two external displays (4K@60Hz). However, the issue with Dock Station persists for even smaller resolution.

I found a workaround recently, which is hard to explain but it works nevertheless.

On MacOS go to Preferences –> Displays, then hold Option key, you will notice that bottom button 'Gather Windows' becomes 'Detect Displays'. Just click on 'Detect Displays' button, and image shows up with no mouse lag.
 
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crazy l3oyz

macrumors newbie
Jan 6, 2012
13
0
Can you share which cable that you've gotten? I'm having the same issue when I'm connecting my M1 Mac Mini with my 27inch 4K Dell monitor as well. I'm using HDMI - HDMI cable.
 
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BigMcGuire

Contributor
Original poster
Jan 10, 2012
7,195
8,828
the Alpha Quadrant
Can you share which cable that you've gotten? I'm having the same issue when I'm connecting my M1 Mac Mini with my 27inch 4K Dell monitor as well. I'm using HDMI - HDMI cable.
Sure - I ended up going with these - they worked. And they work on my Samsung 4k as well. I wasn't able to get 60fps on the dongle reliably so I just went straight to USB C to DisplayPort.

 
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Ataliano

macrumors newbie
Feb 14, 2021
1
0
Same issue here with an iMac 2020 5K... terrible experience so far for a computer worth $4.500.

Had to return the first one because after upgrading the RAM to 128Gb (OWC) it gave kernel panics all the time restarting the computer.

Now, with a brand new one, I have the f**king lag issue with the cursor which is totally annoying. Figured out reading here it's due to the external display and so far seems to be the case, as when it happens, simply disconnecting the display and connecting it back again works (for some time).

I'm using a DELL UP2516D and using a DP to USB C cable from Syntech (seems good quality, at least the build).

Thanks I found these posts and figured out what it was, because I was thinking of sending it back to Apple again...

Hope this is the last issue I get on this one, because I'm starting to get very tired about Apple products, extremely expensive and worse year after year...
 
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Shunt9

macrumors newbie
Mar 22, 2009
1
1
I had the same issue, in my case I was using the monitor and cable already for over a year without problems.

The issue started when I connected the screen when the macbook was sleeping. When turning on the laptop the monitor was connected in 'mirror mode' (which I never use), when disabling mirroring again, the screen settings were all reset (color profile, scale, etc) and the problem started.

Rebooting, disconnecting, resetting SMC / NVRAM all did not help.

Eventually what I did was:
- Open up display, switch around the scaling a bunch of times
- Put laptop to sleep (with external monitor still connected)
- Wait a bit, wake back up
- Mess around with the scaling again.

I've seen the scaling trick around, but it wasn't enough in my case.
 
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legaleye3000

macrumors 65816
Jul 31, 2007
1,336
26
Same issue here with my Late 2015 iMac 27inch and new Dell U2720Q (4k)... Connecting HDMI on the monitor then to a hdmi-thunderbolt 2 adapter, then to thunderbolt into the back of the iMac. I changed the refresh rate on the Dell to "Fast" from "Normal". Mouse lag occurs at different scalings... Any help appreciated. Thanks!
 
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