Lightroom Classic 9.2 is incredibly slow after updating Mac Pro to Catalina

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I updated my 2013 Mac Pro to Catalina yesterday, and now Lightroom Classic, which was running perfectly fine on Mojave, is super slow.  Adjusting sliders is painful..it takes a good two seconds for the slider to move, and simply switching between images in the library grid view takes a little over two seconds just to switch to the next image.  That action was previously instantaneous.  I am very disappointed and wish I could switch back to Mojave, but can't now. I know all about the performance suggestions (using GPU, etc), but nothing is helping.  
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Marc Pagani

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Posted 3 months ago

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Rikk Flohr, Official Rep

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A clean reinstall of Lightroom will likely help.

Lightroom Clean Install Procedure 
  • Close Lightroom
  • Restart the computer
  • Use the Adobe Creative Cloud App to uninstall Lightroom Classic
  • Restart the computer
  • Install Lightroom Classic via the Creative Cloud App without launching any other programs.
  • Restart the computer
  • Launch Lightroom
  • Wait 5 minutes
If performance issues persist after this procedure and reset of your preference file, then it is likely an issue that needs troubleshooting further.A Preference File will survive a Lightroom uninstall/reinstall. Sometimes weird behavior is corrected/cured by resetting the preferences.

Reset Procedure:

1. Close Lightroom.
2. Hold down [Alt/Opt]+[Shift] while restarting Lightroom.
3. Overwrite the Preferences when prompted by the dialog.
4. Close Lightroom.
5. Restart Lightroom.

Does the performance issue continue after resetting the preferences?
(Edited)
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Marc Pagani

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Rikk, thanks for your quick reply.  To answer your question, yes and no.  I have a two monitor setup...one is a BenQ 4K monitor on my left and the other is an Apple 30" Cinema Display at 2560x1920 on my right.  When I only use one monitor (I.e., no secondary display) performance is as it was before updating to Catalina - quick as expected.  However, when I have the main grid library view (with library, develop, map, etc on the upper right hand side) on the 4k monitor, and the Apple display showing the loupe (large image) the performance seriously lags and I'm back to square one.  Likewise, when I put the library grid on the Apple display and use the 4K monitor as the loupe, the performance is somewhat slow, but not as slow as the previous scenario.  So, the ONLY way I get normal performance is if I don't use a secondary display, and that's not an option.  Any suggestions?
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ray

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I installed Catalina shortly after it debuted and it crashed my computer.  I am back on Mojave.  I don't remember precisely how I did it but I talked to Apple and they suggested that I go back to Mojave.  I followed their instructions and then I went into Time Machine to the nearest date before my Catalina download.  I then restored my iMac to Mojave.  Everything is now fine.  Based on your raising this  issue, I will not try to install Catalina in the near future.
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Marc Pagani

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This reply was created from a merged topic originally titled Lightroom Classic: Very slow performance in Catalina when using secondary display....

I have a two monitor setup...one is a BenQ 4K monitor on my left and the other is an Apple 30" Cinema Display at 2560x1920 on my right.  Lightroom Classic worked perfectly fine like this in Mojave. However, since updating to Catalina, when I only use one monitor (i.e. no secondary display) performance is as it was before updating to Catalina - quick as expected.  But when I have the main grid library view (with library, develop, map, etc on the upper right hand side) on the 4k monitor, and the Apple display showing the loupe (large image) the performance seriously lags and I'm back to square one.  Likewise, when I put the library grid on the Apple display and use the 4K monitor as the loupe, the performance is somewhat slow, but not as slow as the previous scenario.  So, the ONLY way I get normal performance is if I don't use a secondary display, and that's not an option.  Any suggestions?
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Carlos Cardona

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Question: did you do EVERYTHING that Rikk suggested?
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Marc Pagani

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Yes. Every. Thing.
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Carlos Cardona

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Let's try the "once over": Run Onyx to rule out a corrupt cache or application state, instructions below (I was a Mac IT pro for 25 years).

Download the free Onyx (https://www.titanium-software.fr/en/onyx.html), select the Onyx version for your OS, download, run it, reboot.

In Onyx run almost everything in the Maintenance tab, deselecting things you may not want deleted, like Launch Services (resets which apps run which files back to default). Hit the "Options" button across from "Internet" and deselect more stuff like Cookies & Other Site Data, Browser History, Form Values, etc. (all of these are OFF by default, but you may want more of them off). If you don’t know what something is, google it, or don’t run it, or ask me), then hit Run Tasks. After it's done it will ask for a reboot.

Also try to fix any directory damage by running Disk First Aid from Disk Utility: boot into Recovery Mode, (hold down Command-R when booting). When you're in Recovery Mode go to the Utilities menu and launch Disk Utility, say Repair Disk. When done go to Apple Menu for Startup disk and restart normally. (If Disk Utility says it can't fix it, run Disk Warrior ($120), (https://www.alsoft.com) from an external boot drive, reboot.)

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Marc Pagani

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I appreciate the response. Can you tell me how speed/performance issues in an app like Lightroom are related to the processes that Onyx does?
(Edited)
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Carlos Cardona

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Onyx mostly helps with crashing issues or sometimes weird, buggy behavior. By deleting caches and application states, it might fix the problem. Directory Damage can also lead to crashing or slowness, when files get written to damaged areas.