Mouse cursor lags with external monitor

Well, experiencing this too.

Setup:

OS X 10.9.4

Macbook Pro 15" Late 2013 with nVIDIA chip

miniDP to VGA adapter i just bought today

an LG W2452T as external monitor

I'm gonna test this with a Samsung and another Monitor by a dead brand i don't even know the name of anymore just to be sure it's not my monitor acting up. Although, i had it connected to a linux desktop some days ago.

I have a Macbook Pro Retina 15" mid-2012, connected to an Apple Thunderbolt Display, and I'm having the same issue with my Magic Mouse on the Yosemite GM. Huge lag, and unfortunately, disabling transparency in the Accessibility settings didn't help.

Ive had this same problem for the last 3 years on 2 different macbook Pros (17" early 2011 & latest mid 2014 MBP fully spec'd out) - and an apple thunderbolt monitor. The weird thing is that it just comes and goes from day to day. I can't find a pattern. It really *****. I bought the new mbp to fix the problem, but it didn't.

I have a late 2012 27" iMac with an Asus PB278Q external monitor connected via mini display port to display port. I have the the same cursor lag/eratic cursor issue with a bonus of both displays sometimes just being black. The cool part is that when both displays are black the cursor is visible and doesn't lag. Awesome. I bought several cable thinking that was the problem. The apple display always come back if I just unplug the cable from the mini port, and sometimes comes back if I turn the Asus off, although it can take a few tries. This is my work machine so this is very annoying. I had high hopes that Yosemite would solve the problem but it has not.

I'd also like to mention that this is my 3rd iMac, the other two have been replaced under apple care for excessive image retention. This one has it too but there is no fix and I can't afford to be without the machine while they're (not) fixing. Apple is really on a roll.

I have same issue with mbp 15 mid 2012, os x 10.10 and lg 29um55 connected via miniDP - DP cable. Connect via hdmi don't help and in addition max resolution limited to 1920x1080 instead of 2560x1080.

Two years ago, on os x 10.8, when i connected another full hd monitor via hdmi, mouse lags similarly.

Same issue...never had this ever before...but a week after upgrading to 10.10 I now have this too..

Mid 2012 Macbook Air 11"

DELL monitor

Logitech USB mouse

nothing helps...will do a clean install of 10.10 next weekend...will report back...

Same problem here but with a 27 Samsung monitor:

MacBook Air mid 2012

1.7 GHz i5

4 GB AM

intel HD graphics 4000

Samsung S27C350 Monitor

Apple really has to do something. Nearly 10 pages of complains should be enough...

Fuenticito, that is a great suggestion. I just submitted feedback and I will do so again every time I have the issue, which is several times a day. I created a text doc with the feedback link, and my feedback, which I'll keep open on my desktop to speed up the process. Note that you only get so many characters so be concise. Hopefully, If everyone does this Apple will not continue to ignore the issue.

I'm also having this problem with the U28D590 4k Samsung Monitor when using PIP/PBP. It's really annoying. I submitted feedback referencing this thread and I also reccomend everyone else does as well.

Toggling the display port version from 1.2 to 1.1 back to 1.2 only worked the first time I tried it. I turned the monitor off and on and now it doesn't seem to do anything.

This is not a mouse problem. It's a display problem.

Actually, after more experimentation, it might be a monitor issue. I'm getting the same behavior in windows also. I'm not sure what is causing the problem. Maybe it's just HDMI lag? The first monitor is connected via DP.

I am having the same issue with my MacBook Pro (Retina, 13-inch, Late 2013) 2.6 GHz i5, 8GB Ram, Intel Iris 1536 MB graphics card, and a ViewSonic VG2236wm-LED external monitor connected through a DisplayPort > DVI adapter. I also just submitted this to the feedback link.

Same problem here with a MacBook Pro (Retina, 13-inch, Mid 2014), OS X Yosemite 10.10.1

At work I try to use a setup with a DELL U2412M and also tried with a Samsung Syncmaster 24" both connected via Thunderbolt -> MDP -> DVI

I reported the issue to Apple via their feedback form and linked to this thread. But I have little hope that this issue will be fixed once and for all in the near future.

I have Retina MacBook Pro 13' and LG-34UM95-P ultra-wide display with Thunderbolt connector. My Logitech Anywhere MX is terrible, laggy, can not be used when an external display is connected. I use the Magic Trackpad with no problem, no lag, but I can't use all day, because it's pain in my hand. Yes I have tried a Magic Mouse, but it's not ergonomic. I hope to improve the lag, but I doubt it. If I switch to Windows, if mouse lag doesn't change. This is so horrible. I'm not an happy Apple user... Do you have any tips that will help me? Thanks!

Ratina MacBook Pro 13' late 2013, OS X Yosemite 10.10.2

LG-34UM95-P, 3440x1440, Thunderbolt connector

Restarted. MacBook open, but it's still laggy.

BT off, no change.

The display doesn't freeze, just mouse cursor is laggy.

No, this is an old Microsoft Intelli mouse, and a Logitech RX250. Both are s...t.

Trackpad works fine, but uncomfortable. I have a pain in my hand.

There are times when everything is going well, but soon coming mouse lag. I don't know why... This is not the mouse problem, Apple's software is not good. I have used Windows. Any mouse is perfect, no lag, no delay. I'm tired...

This is definitely an issue that appears when an external monitor is connected. And it is an OS X fault.. really annoying. Did you verify if it is only the mouse cursor or the whole screen that is freezing/lagging?