Like you I found that the late 2013 Mac Pro could easily handle two displays, but then it had a p.s poor GPU compared to what's now available, thus the two displays could easily stay in sync. With my Mac Studio M1 Ultra with 20 core CPU and 48 core GPU and MacBook Pro M1 Pro with 10 CPU cores and 16 GPU cores are both slow as treacle with stutters and lags between the two displays, which makes 2 display setup unuselable, espcially if 4K is scaled to anything other than 1080P. See the box with yellow line around for info on same. The secondary display does not benefit from GPU acceleration. Same goes for when I completely unhook the second monitor it seems to work flawlessly on the XDR monitor. > When I turn off my secondary display in lightroom all goes back to normal and performance seemes to be restored. I would much rather sit down at my desk top workstation and use my dual screen setup to fly through edits but that just hasnt been the case. Ive had to resort to only editing on my Macbook Pro for the last couple years because that just works as its supposed to. Why do i have a 6 year new computer that costs 3X as much but yet the performance is less than what it was before. My old trash can Mac Pro I always used dual screens to edit and never had any of these issues. When I turn off my secondary display in lightroom all goes back to normal and performance seemes to be restored. its almost as if the graphics card cant output to the screen normally. There is also lag in when the eidt is aplied to the image. When I move a slider the slider sticks and wont stay attacted to my mouse. Same goes for when I try to edit an image. The UI is supper laggy, I cant scroll through my library of images with out it stopping and freezing then catching up and then lagging. I have tried the second monitor being Apple stuido display, an old dell 1080p, and a HP 32" and seem to have the same results with all. I would have expected a fix for this by now but I guess that is expecting way too much from Adobe. I've had the 2019 Mac Pro now for over 2.5 years and were fast approaching 3 years.
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