I'm experiencing the same with my M2P. Moving to HEVC might be a bit of a headache for some and may incur some costs. They is a slight learning curve too.
I have FCPX 10.4 running on macOS 10.13.16 on a 2017 5K iMac and a 2016 MBP and playback through Finder is very choppy. Clips play better...
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