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Hi, I'm using Lightroom classic on a 15 month old iMac Pro, which is usually lightening fast, with a powerful graphics processor and lots of RAM. Im still running Mojave as I have a number of programs incompatible with Catalina.
After updating to 9.2.1 I'm finding that the adjustment brush in particular is running really badly, with beachballing happening after only a few stroke with the adjustment brush. It always used to work instantly. The same with noise reduction, i used to have instant results as I moved the slider but now its move and wait.
I've run diagnostics on my machine and all comes back as working properly.
I've tried purging the cache which made no difference.
Please help as its becoming unusable. I really don't want to start learning a new raw processing program, but I can't work with lightroom like this.
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What happens when you turn off Use GPU in your Preferences>Performance tab? Does that make a difference when y ou use the adjustment brushes?
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On the 15 month old iMAC Pro, what did you update Lightroom Classic from? What version?
Or was the previous experiance on an older computer?
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You could try adding the plugins one by one to see if any of them are the culprit. That being said, I suspect the preference file was the culprit.