Updated to LR Classic v15.0 and program is now extremely slow.

[Rlrood]

After installing LR Classic the app is now so slow that it is unusable. Windows 11, strong PC.

[Rikk Flohr: Photography]

@Rafael Aviles 

Your symptoms could be the result of a bad install.  I don't see here where you've done a clean reinstall. I would recommend doing so. 

Clean Lightroom Install Procedure

• Close Lightroom
• Restart the computer
• Use the Adobe Creative Cloud App to uninstall Lightroom
• Restart the computer
• Install Lightroom via the Creative Cloud App without launching any other programs.
• Restart the computer
• Launch Lightroom
• Wait 5 minutes

[Rlrood]

Thanks Rick. Did exactly that and no improvement. Thinking about going back to 14. something like that, the last version that ran well.

[Rikk Flohr: Photography]

I am running multiple machines (9) Mac and Windows with no issues so I suspect there is something amiss on your machine. 

The next step, even if you've already done so, is to reset Lightroom Preferences using this method. 

This procedure works for both Lightroom Classic and Lightroom Desktop.

If you are using Lightroom Desktop, it can change your local storage location. Please review this setting after resetting 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.

[Rlrood]

I suppose this question will come across as a bit uninformed (stupid), but will your procedure leave me with a completsely blank set of preferences, or what?

[Rikk Flohr: Photography]

It restores your Preferences to the Default state (fresh install). Your preference file survives intact via an uninstall/reinstall so it is necessary to reset it separately.

[Rafael Aviles]

Thanks, Rick. I was following your procedure but when I got to the third step, I noticed that the Uninstall option was grayed out. Then i discovered that the Creative Cloud App was in the process of uptading LRC to version 15.0.1 on its own. I let it complete the update and after several minutes, I launched the new version and...the problem came back after I edited a photo. Argh! 

I should say that I have reset my Preferences several times before while I was trying to fix the problem, as it is something that several people recommended.

I am not sure what to do next!

[Rikk Flohr: Photography]

The auto-install probably soiled things.  I recommend turning it off temporarily. 

Disable Auto install in the CCD App

Perform again the Clean Install
Perform again the Preference Reset.

The order is important.