Lightroom Classic CC 7.5 Slow After Upgrading to macOS Mojave 10.14 on iMac Pro

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  • Updated 2 months ago
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After upgrading to macOS Mojave 10.14 on my iMac Pro everything within the Lightroom Classic CC (7.5) application has been slow. Moving from picture to picture takes a second, even moving from Develop to Library takes a good two seconds to process. Sliders sometimes work instantly but then will decide to take a second or two to process. Cropping is very jittery and just a nightmare to use right now. 

Everything was working fine prior to the update. Tried all of the usual troubleshooting steps (disabling graphics processor in performance, pausing lightroom sync, purging & increasing cache etc.).

Is anyone else having problems? I'm seriously thinking of going back to High Sierra. 
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John S

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Posted 3 months ago

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Jeff Harmon

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I just tested things out pretty well and don't see this problem.
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dmeephd

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I made the switch to Mojave as well and have realized a pretty good performance increase for Lightroom and Photoshop on my MacPro.  (The Dark Mode theme looks like crap, however, and there are subtle white borders on the bottom and left edges of the Lightroom window, even when expanded to full screen.)

I did see on MacOSRumors something about your issue with some iMac installs of Mojave and the solution seemed to be removal and rinstallationof Mojave.
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John S

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It was a pain but after performing a clean install of Mojave, Lightroom’s performance was completely better. I haven’t had any issues since the clean install.
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Michael Smale

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What do you mean by a “clean install” ? Just a reinstall?
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Thomas Babut

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I'm experiencing the same performance problems with my upgraded Mojave on my Mac Pro 6,1 (2013). I am using only one 4k monitor.

I've tested Lightroom 6.14 with no difference in performance, too. Also with disabled GPU it runs slowly.

There were some noticeable improvements in the Lightroom 7 (now known as Lightroom Classic CC) releases throughout this year, especially on importing large number of photos, but overall I'm still very disappointed with the performance. The whole UI is lagging on switching the modules or scrolling through the settings.

I made a big mistake on testing out Capture One Pro 11 these days. It runs fast and the image quality is on top. Capture One Pro is also capable of using my two GPUs. It's a fascinating experience how fast my Mac Pro can be. I cancelled my Adobe Subscription, that runs out in October and now I'm thinking of switching to Capture One finally. 

I cannot imagine, that Adobe makes Lightroom Classic CC running as smooth as Capture One Pro within the next months. And it stinks, that there is no perpetual license anymore, yes I know, it's a completely differnet story but I'm simply frustrated with Adobe at the moment.




(Edited)
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John S

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Michael: A clean install involves erasing the entire hard drive before reinstalling the operating system. Here is a pretty good guide, there’s also a link that goes over how to make a bootable USB installer of Mojave if you haven’t already: http://osxdaily.com/2018/10/03/how-cl...
Another option is to wipe the hard drive in macOS Recovery and then perform a full install through that. (I ended up having to do that due to the T2 chip on the iMac Pro. I completely forgot about the new chip which prevents bootable usb drives from working without downgrading security settings with use of an admin account. Unfortunately I already had an erased hard drive so there was nothing I could do.)

Thomas: Before giving up on Abobe I would try a clean install. It was really night and day with my iMac Pro. Something must get messed up in the upgrade process on the os level that has something to do with Lightroom on these pro machines.
Regarding Capture One, I haven’t tried it. Might have to get a free trial and see how it is!
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Butch_M

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A clean install on macOS is a good thing every few generations of upgrades. 

What happens is you can accumulate a significant amount of cruft in supporting files located in the user Library from legacy versions of software, software that is now deprecated and/or the original app has been deleted and no longer used. Sometimes these files can confuse and conflict work being done behind the scenes, thus causing an unnecessary performance hit.

All the legacy files are nothing more than dead weight and really need to be purged ... this is the advantage of a 'clean' install.

Even if you purchase a new computer, using Migration Assistant to pull your data to the new unit will bring along all this unwanted cruft with it because, unfortunately, there is no way to pick and choose which files to migrate, it's an all or nothing effort. It's best to manually restore that data from your backup as needed.
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Rikk Flohr, Official Rep

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@Michael Smale

Clean Reinstall Procedure.

Close Lightroom
Restart the computer
Use the Adobe Creative Cloud App to uninstall Lightroom Classic CC
Restart the computer
Install Lightroom Classic CC via the Creative Cloud App
Restart the computer
Launch Lightroom 
Wait 5 minutes

After this, does the performance improve?
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John S

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I tried just reinstalling Lightroom/creative cloud and it didn’t help. The only way I got it to work was by erasing the hard drive and reinstalling the entire operating system.
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Reetesh Mukul, Employee

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@John S -- do you still see the issue, or it is better now after OS install.
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John S

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I haven’t seen any issues. Lightroom is working perfect now. Processed 250 RAW files from a 5Ds last night in Lightroom and everything worked flawlessly and the software was really fast. Night and day from my experience the other week. As Butch M pointed out up there, you can’t transfer everything from a Time Machine backup. I manually moved the files I needed from a Carbon Copy Cloner backup.