Lightroom CC: Slow performance and scrolling - iMac 2017

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Hello there.

I have a 2017 i7 4.2Ghz iMac with 24GB ram and the 580 Pro 8GB graphics card, and the performance of the new Lightroom CC is at certain points very very bad. 

Scrolling through the photos is an pain, its very slow and choppy, and if I scroll a bit faster, the program gets hang on the scrolling direction I was scrolling for some seconds. If I reduce the window size, the scroll gets smother (not perfect). Which makes me think that the program is not optimized, at all, to retina displays. Any album with more than 30 photos and I'm spending more time scrolling than editing. And going to the "all photos" tab is not an option.

Anyone experiencing this? Any temporary fix? I notice that if I change the grid view, it gets a bit better, but not by much.

Plus, some edits, like the brush edits, are also very slow to take effect. When I'm painting with the brush it lags a lot behind my current cursor position. 
It's a bit disappointing because, despite not being 100% smooth, I have a better performance on lots of Lightroom functions on my almost 7 years old MacBook Pro without a Retina display.
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Nuno

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Posted 11 months ago

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Joeri Kemp

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I have the exact same problem. LR Classic works just fine on my macbook (albeit mine has a retina display), but on my brand new Imac it is just unbearable.
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prudhommea

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I am also experience this issue. Purchased a new iMac to use with Lightroom and am seeing significantly better performance on my 5 year old MacBook Air....
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Amado Corominas

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Only as a test, try to disable graphics card acceleration. If LR goes faster, you will know that the issue is GPU related at least. It happens on some GPUs (don't know why though)
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Joeri Kemp

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I actually managed to find the problem. It's LR itself. Lightroom apparently cannot handle the 5k screen well. Change your display to scaled (largest possible) and make sure your thumbnails in LR are quite big. Watch the magic happen. I'm getting a way better performance this way. Good luck!
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Raphael

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Did not work for me. No matter what scale setting I choose it's very slow and sluggish.
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Joeri Kemp

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Really sorry to hear that, Raphael! I hope you find a different solution!
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Emma Carr

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Is your graphics processor switched on in preferences? Adobe kept switching it off for me when we did screen shares, but I switched it back on prior to doing what Joeri advised and so far its been much better, hope it can get sorted I can totally relate its been so dreadful to work with the software in that condition!
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Raphael

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Yes. I tried disabled and re-enabling it. Also reinstalled everything. Still a pain to use. On my Windows PC with a 4K Display Lightroom CC is super fast and super smooth.
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Emma Carr

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only other thing I can think of which I still have as back up plan if this goes wrong again, is connecting another monitor to the iMac so Im not using the iMacs display, not even sure if that would make a difference but worth a try, worse case scenario stick with your PC until an update fixes, saying that Ive had this issue since I got my iMac and every update has failed to fix it 
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Ryan DeMont

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Are they going to make a fix for this so Imac owners don't have to change their screens? These are expensive computers that speaknig for myself, I got with lightroom and photoshop in mind. I'm having the same problem as everyone above and it's March 7. Clearly there's no rush. 
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Monty

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For a while I was using a maxed out 13” MacBook Pro. I too noticed scrolling in grid view to be a bit choppy. Not bad, but not as smooth as I’d hope.

I switched to a 10.5” iPad Pro. LRCC screams on it. Scrolling is VERY fast and smooth. Much faster than the MBP

Monty
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sjm88

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Is there any update on this? It seems absolutely crazy that my maxed out dGPU MacBook Pro cannot scroll through photos, and my iPad can do it just fine. Has any optimisation been done at all?
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geshon

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The 5k display are great but always a problem with some apps. But the display is not new and I really wonder why Adobe didn't fixed this issue! I can't work with Lightroom. Changing color temperature last over 5 sec to take effect ... I wonder why Adobe did not take their users/clients seriously ... So many bugs and wishes and it often takes years to get an answer ... or never. And I always landing in a new looking support forum instead of have a chance of directly contact via email ... Frustrating ...
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Ben Fletcher

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You aren't downgrading your display. It still has the same number of pixels. It just uses them to draw things a bit bigger. If your camera has more than 14MP, you aren't seeing them pixel for pixel on a 5K display anyway. All it does is uses a different algorithm to make the image appear larger, while at the same time reducing the number of calculations required to draw the screen. This workaround works because it reduces the load on the CPU and the GPU. 
(Edited)
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Ben Fletcher

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In fact, it's an Apple supported solution:

"The Retina display offers scaled resolutions. These allow you to have text and objects appear larger and more visible, or smaller, which provides more space for windows and apps. Your Mac will show either four or five scaled resolution options depending on its model."

https://support.apple.com/en-au/HT202471
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Raphael

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No, Ben Fletcher. When I select "Larger text" in display settings, any element on my screen is HUGE. They are so huge that I cannot have two browser windows in split view. Having said that, it definitively feels like I'm downgrading my screen from 27 inch to 19 inch.
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Ben Fletcher

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You can have two browser windows side by side in full screen, you just need to set the zoom on them too. (The browser will remember your settings next time.) You can change the size of the icons on your desktop (Finder->View->Show View Options)  and you're away. I understand that you *feel* like you are downgrading your machine, however changing a machine's settings to garner optimum performance is all part of the job, really.

To illustrate - The 5K iMac is a *pretty good* (not awesome) machine for editing 4k video, but out of the box it is woeful - almost unusable with any product other than Final Cut Pro. You need to run your OS from an external SSD, set the internal fusion drive as your video cache drive, then host all your 4K footage on a nice quick thunderbolt RAID array to be able to leverage industry standard programs like Davinci Resolve and (to a lesser extent) Premiere Pro and After Effects et al. I have a 2015 iMac set up just as described as above, and I certainly don't feel like I have downgraded it. In fact, it is a video editing weapon.

Same with the one we use for photos - different resolution to leverage Lightroom performance, faster SSD boot drive, files stored on a fast external RAID - the machine hums along and performs it's primary task quickly and quietly. 

Tl:dr Correctly setting up a machine to perform the task that it is required to do is part of owning a machine, not a fault.

P.S. What video card and memory does your machine have? I'm guessing if you hit the apple menu then click "About this Mac" you'll see something like this:
"AMD Radeon R9 M395 2048 MB" Unless you had your machine specifically built to order from Apple, chances are that's your lot. 2GB of graphics memory ain't a lot for a beastly program like Lightroom.
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Raphael

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Ben Fletcher, increasing system-widely the size of any visual element *CANNOT* be the solution. It’s a workaround full of compromises, and even then, when the display is set to “Downscale”, Lightroom CC is stuttering and gets stuck while scrolling.

My point is, that Lightroom CC Classic worked perfectly on the same iMac with the same graphics card and the same amount of images.
Even a 5 years old Windows Notebook with an Intel Card handles the new Lightroom CC *EASILY*.

To me it seems that Adobe simply hasn’t Lightroom CC optimized for Mac (yet), which is quite surprising.

Aren’t their main customers Mac users?
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PaulTheBuilder

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Just chiming in that I have the same issue. On my 2017 iMac with 24gb RAM, 5K screen, scrolling performance is dismal. If I scroll it stutters and goes slowly and the inputs buffer until Lightroom becomes unresponsive as it continues scrolling. On my three year old PC it's pretty buttery smooth, as is Lightroom on iPad. Apple Photos scrolls smoothly with the same pictures too, so it's not the machine...
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Paul Elliott

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Having the same problem here. Top of the range iMac. Scrolling is horrendous.
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Raphael

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Paul, have you tried Lightroom CC Classic before? If yes, have you had the same performance issues with that version or did it run smoothly?
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Paul Elliott

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Hello! Yup. I run both. Classic is the most problematic.
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Ben Fletcher

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Hey Paul I stumbled on a post before that had a whole bunch of people with the 2017 machines saying they were having the same problem.... I wonder if that is yet another separate bug... It seems that LR Classic really is getting too big for its boots....

https://feedback.photoshop.com/photoshop_family/topics/lightroom-classic-cc-7-1-so-slow-on-2017-imac

This sounds more like what you are exeriencing? 


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Paul Elliott

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Soooo, my situation is not that bad. It's specifically scrolling in the Library Module. That is painfully slow. Even slider adjustments are quick enough. Interface repainting is a little laggy, but above all, Library scrolling is bad.
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Paul Elliott

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Ah. Seems that smooth scrolling is literally supported in Windows only. From the Adobe support site: