Eizo CS2740 and terrible slow retouching in PS

[garym45725895]

Help please. I'll be consise.
Purchased an Eizo CS 2740. It's USB c connected to my Mac Mini. OS Sonoma.

My older Eizo CG241w is now my second monitor. 

For some reason this new 4k monitor is sluggish/glitchy/slow when retouching in PS.

Terrible. 

However, when I use my older CG241w retouching is super fast like it should be.

So, what is going on and does anyone else have issues too? Is there something I need to know or do?

Thank you.

[kglad]

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

<"moved from using the community bugs">

[Conrad_C]

A possible part of the explanation, depending on your system specs…

The CG241W is 1920 x 1200 px, or 2.3 million pixels (2.3 megapixels).

A 4K display like the Eizo CS 2740 is 3840 x 2160 px, or 8.3 million pixels (8.3 megapixels).

That means that if the CS 2740 replaced the CG241w, the Mac mini graphics hardware must now drive about 3.6 times the number of pixels it used to.

But if you have connected both displays, then the total number of pixels now being driven is 10.6 megapixels. That means for rendering to the screen(s), your Mac mini graphics hardware is having to do almost five times as much work as it did when the CG241w was used alone!

Now, should your Mac mini be able to handle that?

That depends on which Mac mini it is.

Which model is it?

The older Intel Mac mini had Intel integrated graphics only, which is very limited.

The M1 and later Mac mini, based on Apple Silicon, has much more capable graphics hardware and should be able to drive both displays easily, if it has enough memory to do so.

As graphics software takes advantage of more GPU-accelerated features, it is increasingly possible for the display bottleneck to be the limited graphics hardware in older computers. But we won’t know for sure if that’s the cause of your slowdown, until we know which Mac mini model you have, and how much memory (not storage) is installed.

[Lumigraphics]

Have you tried connecting via HDMI? I have an LG Ultrafine 4k connected to my M1 Mac mini and it works great, but it uses Thunderbolt natively. My second display is an HP using HDMI. And try a Thunderbolt cable (I spent the $$ on an Apple Thunderbolt 3 cable) rather than a cheap USB-C cable.