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Choppy 4K playback MC 8.5.3

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I am working in a UHD project, I have imported quick time movies with DNxHR 4:4:4 ... this is an online edit computer.  Playback in timeline is stuttering and choppy at random times.  There are NO blue, red or yellow lines on the timeline, nothing to indicate slow hard drives (I get over 1000MB/s on my fast RAID 5, and yes NO drive indexing on the RAID) and surely my system could not be wanting, I have dual 10 core zeons and 128GB RAM.  With all this speed under the hood, stuttery playback is definitely not expected.  Wondering if anyone out there can share any insight.  Specifically, if there are no red or yellow lines in my timeline, then why is the playback sub-par?


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