Photoshop slow rendition on Fit to Screen 27" Retina 5K Display

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  • Updated 12 months ago
  • (Edited)
I installed Photoshop few days ago on my (new) 2017 iMac with 27" 5K Retina display (i5 3,4 GHZ, 4 cores, 16 GB RAM, Radeon Pro 570 4GB). I mainly work with photographs (20-50 megapixel in size) and use "native" screen resolution (which is something like 2560 x 1440px). When images are scaled to fit the srceen (around 67%) every turning on/off layer or group of layers gives me around 2-3 sec lag. Also, if I apply some adjustment layer, it takes some time to render the changes (eg. moving a point on curves). I noticed few things:

- it doesn't affect the brushes (they all work well and fast);
- it doesn't affect zooming (I can zoom super fast between super small and super big) *except* fitting it to the screen (Cmd + 0) - there is a small lag before it fits exactly;
- everything works well and fast if I do one of the following things: zoom out (so the zoom is around 50% or smaller) or change my monitor resolution to lower (eg. 1600 x 900);
- everything works *little* faster when I zoom waaay in to the image (so I see just a small portion of it);

I did try various settings from the optimize performance article (https://helpx.adobe.com/photoshop/kb/optimize-photoshop-cc-performance.html) of which most of them had none effect, and some made it worse (like turning GPU off). Right now I have around 10GB RAM allocated to photoshop, use 4 cache levels and 1024 KB tiles). I also tried downloading Photoshop CC 2018, with same effect.

My performance indicator sits on 100% almost all the time (I did manage to drop it down to 98% for a moment, but with adjustment I don't really use).

To me it's a real problem, as it seems Photoshop runs slower on machine with better specs, than it used on my 4 years old Macbook Pro. And I really don't want to use smaller resolution, as it makes biggest advantage (screen space) redundant. Any suggestions?

My System Info is in Polish and I can't seem to change the language of Photoshop only, without changing it in the whole MacOS. If you really need it, hit me.
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Andrzej Muzaj

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  • frustrated and angry

Posted 12 months ago

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Yves Crausaz

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Is your system disk an SSD? Personally I have the configuration iMac just above is no problem lag in PS, except for 3D rendering and Vid o, but that's normal in my opinion.


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Yves Crausaz

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Here is my basic configuration
HD = 500 GB SSD
40 GB of RAM

So a little more powerful than yours!




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Andrzej Muzaj

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That's true that yours is more powerful than mine, although I think you miss my point. I have no issues with running photoshop smoothly on a slower machine that my iMac.
(Edited)
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Yves Crausaz

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Yes. but the other machine has the HD disk which is an SSD?

Fusion drives that have only 32 GB of SSD are not faster because there is not enough space on this SDD to put the program, and the data so the majority of accesses are on the disk plateau that unfortunately turns only 4200 rpm if I'm not mistaken .... And so this is where your machine has its weakest point unfortunately, that's why I propose you to move the system on an external SSD, a lot of people with a configuration similar to yours took this path. Good luck, or quickly resell this iMac is take the most powerful with an SSD in HD.




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Yves Crausaz

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If not, call Adobe to see with them!

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Andrzej Muzaj

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The other one has SSD, that's right. Although, I'm not sure if the Photoshop uses any part of HDD when it's already running? As I mentioned - the performance indicator is always on 100%. And the problem doesn't occur always - it's related to particular zoom / resolution settings.

I'm writing here - that's next best thing after calling, isn't it? ;)

EDIT: I just went again through Optimize Photoshop Performance guide from adobe and here is an interesting quote:

If the Efficiency indicator is already high, an SSD doesn’t improve performance.
I attach a screenshot and a link. Therefore, I think that support my hypothesis that it's not a hardware issue and my setup should suffice to Photoshop run perfectly smooth.


EDIT 2: Well, before anyone else did manage to respond to the thread I bought a Samsung T5 with a USB 3.1 gen 2 USB-C connector and made it a boot drive. And? Nothing changed for the Photoshop. I have quicker response while opening some apps, but generally speaking, the performance did not change. Does anyone have other clues?
(Edited)