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Slowly drains all system resources until crash or computer restart.
In the past this has been symptomatic of a bad install. For troubleshooting purposes, I would recommend:
This procedure works for both Lightroom Classic and Lightroom Desktop.
If you are using Lightroom Desktop it can change the location of your local storage. Please review this setting after resetting preferences.
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.
Clean Lightroom Install Procedure
Restart the computer
Use the Adobe Creative Cloud App to uninstall Lightroom
Install Lightroom via the Creative Cloud App without launching any other programs.
Wait 5 minutes
Does the resource drain still occur?