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While working on Lightroom Classic 10.1.1 on MacOS Big Sur Thé software slows down and I start getting those weird red blocks on my screen...???
What actions in Lightroom Classic are you performing when this happens? Please be specific.
I had the same issue on my system in the develop module, working with crop and a couple
other issues/problems. Disabling the GPU did not solve the problem and I eventually reverted to LrC to 10.0.
I have not had any problems with v10.0 since.