Plex Media Player versions 2.2 to 2.6 LAN direct play issues
Ever since moving beyond the 2.1 branch for the PMP Mac OS X client, any attempt at skipping ahead (single press on the Apple remote, 30 seconds ahead) in a mkv contained H264 or H265 video results in systematic buffering. It can last from less than half a second, up to 2 seconds.
Previous versions didn't exhibit this behavior at all.
If I look at the behavior of the client more closely, it appears that instead of skipping ahead in the buffered data (30 seconds in a 75MB default buffer should be a no brainer) and refilling the buffer in the background, the client seems to buffer first about 7MB and then resume playing.
The issue disappears when we get near the end of the file and there is no data to fetch to fill the buffer, the client just skips ahead instantly as expected.
Server performance isn't an issue (it's an Intel Skull Canyon NUC with Thunderbolt attached local storage and 32GB of RAM running Windows Server 2016) and player hardware performance isn't an issue either (it's a late 2012 Quad-core Mac Mini with 16GB of RAM running OS X 10.12.6) and of course network performance isn't an issue either (Wired Gigabit LAN). Reverting to an older PMP version clears the issue immediately.
From a user perspective, this isn't really the optimal experience I was used to.