I don't know if you are still struggling with this issue on my windows laptop, but I've been dealing with the same issue for a couple of years, and toda I finally figured it out, at least for my machine. I had Parsec installed which had a virtual display driver. As soon as I uninsntalled it, photoshop got butter smooth again. It seems photoshop isn't great at dealing with multiple GPUs, even if they are virtual drivers, it just goes wacky. So check if you have any remoted desktop app or similiar, that might have some virtual display drivers.
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