Lightroom Classic: Has gone slow again

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  • Updated 5 months ago
  • (Edited)
Over Christmas I was going to post a praise of LR Classic CC as it was responding superbly, when using spot removal tool, however it has returned to the hopelessly slow response.
I have turned off synchro, face detection, address lookup & graphics acceleration. I have not changed anything but the difference in performance is massive. I was editing a photo in 5 minutes last week but now it is taking over an hour. 
Is there anything else I could change to improve the performance, please?!

Lightroom Classic version: 9.1 [ xxxx ]License: Creative Cloud
Language setting: en-GB
Operating system: Mac OS 10
Version: 10.15.2 [19C57]
Application architecture: x64
Logical processor count: 4
Processor speed: 3.4 GHz
Built-in memory: 32,768.0 MB
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 21,319.6 MB (65.0%)
Virtual memory used by Lightroom: 37,392.7 MB
Memory cache size: 77.0MB
Internal Camera Raw version: 12.1 [ 351 ]
Maximum thread count used by Camera Raw: 3
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 4485MB / 16383MB (27%)
Camera Raw real memory: 4497MB / 32768MB (13%)
Displays: 1) 2560x1440

Graphics Processor Info: 
Metal: NVIDIA GeForce GTX 775M
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Geoff Culbertson

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  • very unhappy

Posted 5 months ago

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Geoff Culbertson

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Further to my first post, I notice the problem seems to be the program keeps going into 'not responding' mode. It has got so bad today I have Force Quitted the program and given up!

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Rikk Flohr, Official Rep

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It sounds like you have another issue based upon the not responding. Application hangs can be due to several problems. 

Prudent steps would be to:

1. Clean Reinstall the App
2. If necessary reset the preference file. 

Lightroom Clean Install Procedure with the current version:
  • 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?
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Geoff Culbertson

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Rikk, Thanks very much for your response. I have tried all of your instructions twice over and still no difference. After the re-install I have tried with out altering anything and then with disabling the graphics acceleration. No difference again. I still get Not responding every now and then.
Further investigation appears to show this only happens for one tiff file 19700x12400 pixels. The next file in the series is not affected at all despite being similar in size etc. Very puzzled!
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Rikk Flohr, Official Rep

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If you export this troublesome file and reimport it does the new file struggle as well?
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Geoff Culbertson

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Rikk, I hadn't thought of that, however It doesn't seem to be making much difference. I have made a lot of spot removals in this file. It is a scan of a 1930's photograph.
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Rikk Flohr, Official Rep

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Number of spot removals should be irrelevant if you export a flattened Tiff file from scanned Tiff.  Lightroom should no longer know about the spot removals as the file has been rendered with them 'baked in'.  You did make a new Tiff and not just an "Original" copy?
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Carlos Cardona

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Here's how to give your Mac the "Once Over" (it may be a corrupt application state):

 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 . Hit the "Options" button across from Internet and deselect more stuff like Cookies & Other Site Data, Browser History, Form Values, etc. (most of these are OFF by default). 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.

Also just doing a "Safe Boot" can clear out caches (restart, hold down shift until you see "Safe Boot" on the screen, let it fully boot, then reboot normally.