New plex HTPC app, 4k video jerky/unwatchable

That has a UHD Grahpics 620 which is an extremely low power GPU. You will need to change the VideoVideo Playback Quality setting to Low Quality (ANGLE Renderer). Additionally you may want to try experimenting with putting these in your mpv.conf:
hdr-compute-peak=no manual
gpu-dumb-mode=yes manual

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