Seems like i found the solution…
The plex media player app that you download from the download section on plex.tv is not the real player?
I was lurking in the forums and i found “Plex media player announcements”.
If you download the macos file from the latest post you will get in fact the real PMP. After i installed this one (The ordinary file you download isnt even installable) all the stuttering was gone. Now i can watch heavy 4k HEVC files without any issues at all.
After i installed PMP i started the other player and that one still had issues. Not sure why there is even possible to download two different sets of PMP from plex.
Click on the link above and look for the latest release for mac and download that one.
That solved my issues.
