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As a Mac Studio (M1 Max + 64 GB RAM) user, I've never had issues editing 4k clips. After I upgraded to Premiere Pro 25, at that moment the OS was Sonoma, and I was unable to edit any 4k clips. I cleared my cache, prioritized the RAM for Premiere, and rendered clips. Nothing would fix the issue. All my 4k clips lagged so much that I could not even scrub through a clip. Every clip would just show 1 frame and after 20 to 30 seconds would it catch up to the playhead after I stopped.
Solution:
I updated my OS to Sequoia and after the update, I uninstalled Premiere and re-installed it.
It seemed to fix the issue, and everything is playing normally.
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Weirdly I had the opposite issue. I also have the Mac Studio but with the M1 Ultra and after updating both Premiere and Mac OS to Sequoia, Premiere just didn't work. It would crash every 3-5 minutes no matter what. So I had to revert back to Sonoma and Premiere 25.0 runs like butter so far with no crashes.