Lag occurring with various applications when windows are maximised on Apple Studio Display

Etrecheck:

Consider downloading and running this little "discovery" utility, Etrecheck. It changes NOTHING. Etrecheck was developed by senior contributor here, and uses system calls to collect often-needed information.

it contains little tests for speeds of devices, CPU utilization, memory usage, energy usage and a digest of recent problems, in one easy to use package. it does not even need to be Installed. Because less can be learned when your Mac is running great, best time to run is when your problems are actually occurring, if possible.

if you follow the directions faithfully, its report (pre-laundered of all personally-identifiable information) can be "Shared" to the system ClipBoard, then Pasted into an ‘Additional Text’ window in a reply on the forums.

How to use Etrecheck Pro for free

http://etrecheck.com

...

Hello, the same thing happens to me, I have bought the studio display and the mac book pro m3 pro, I use it to work with premier and photoshop and I am desperate and I don't know what to do. The operating system is Sonoma. I have a lot of delay with the mouse when I plug in the studio display. Have you been able to solve it eddie2223???

mouse cursor position updates are done at extremely low priority in the deep background. That prevents your Mac from re-drawing the display 17 times when you move the cursor one micron. Usually, it all works out fine.

In very rare cases where all compute power is being used up doing computation, mouse cursor position may lag. Generally this only happens from time-to-time, and is not annoying, possibly not even perceptible.

By far the easiest way to cause poor performance, instability, overheating and crashing is to install ANY third-party speeder-uppers, Cleaners, Optimizers, or Virus scanners, Bit Torrent, or a VPN that you installed yourself. The main reason is that they are relentless in scanning your files, non-stop, looking for virus-like patterns in Everything, or looking for files that have changed. When completed, they do it all again.

¿Do you have anything like that installed?

I had clean my mac that I already deleted but I don't have any VPN. It is very uncomfortable, I am working with the Apple Magic Trackpad 3 by cable, if I unplug it I cannot even browse a website. It's very noticeable, I don't know what to do.
Can you think of something I can do? ? I have spent a lot of money. Thank you so much

the biggest issue is this one, but there are others:

Major Issues:

    Anything that appears on this list needs immediate attention.

    Gatekeeper disabled - Gatekeeper security protection is disabled. This computer is at risk of malware infection.

    Apple security disabled - Apple security software is disabled. This computer is at risk of malware infection.

Do this:

Settings/Preferences > software update > (Advanced ) >

[√] check got updates

.

.

------

{√] install system data files and security updates

Next:

Settings/Preferences > Security&Privacy > General

---------

allow app downloaded from:

(•) App Store

close the window and save changes

next set:

( ) App store

(•) App Store and Identified developers

close the window and save changes

Ok, I did it. What do you think is happening?