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My Light room classic is very slow when I am going from one photo to another. Also masking takes a lot of time to analyse. I have defragmented my disc, uninstalled and reinstallyed LR CC. Still problen persists. Also exporting as Jpeg takes a lot of time.
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The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.
Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.
https://helpx.adobe.com/lightroom-classic/kb/lightroom-gpu-faq.html#troubleshooting
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html
If Lightroom doesn't start correctly the please see "Solution 2" in the document behind the second link.
Troubleshoot GPU issues | Lightroom Classic (adobe.com)
If it's help then there's a problem with your graphic device or driver. Check if there's new version of the appropriate driver
Another step is to try to reset the Lightroom preferences.
https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/
It's recommended to backup your preferences before you reset the preferences to the default settings:
https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html
If this doesn't help we need more informations about your environment.
Which operating system do you use?
Which version of Lightroom do you use?
Please post the exact version and not only phrases as "recent", "latest" and so on.
Do you get an error message? If yes, please post the exact message or an screenshot.
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