PMS not using all available network bandwidth
All of a sudden my Plex server isn't using all the available network bandwidth for streaming. As an empirical observation only half of the 100Mbps wired link is used, roughly somewhere between 5-6 MB/s out of the max(theoretical) 12.5 MB/s. My Plex has been using all the bandwidth (10-11 MB/s) for month before this issue - I've been noticed it when rewatching a 4k remux (60-70 Mbps bitrate) which played very smooth in the past, but now stutters buffering every 5-10 sec. Has anyone experienced this issue so far?
My setup below:
Server: latest Plex ARM64 version available from https://dev2day.de for RPI3 - wired network 100 Mbps, 4TB USB Hdd storage
Device: XPLAY (direct play/stream, no transcoding) on LG 55EG920V TV - wired network 100 Mbps
Network: wired 100Mbps cat 5e router/switch
I can copy files (scp/smb) from RPI3 at ~10 MB/s and a speed test on the TV's browser gave me almost identical result. On the RPI3 I measured the bandwidth with speedometer and the CPU never rose above 25% during streaming.
As a conclusion the TV and RPI3 can transfer at 10 MB/s, but Plex only streams at half that speed. All the movies (4k or 2k) with a bitrate less than 5 MB/s would play smooth enough, while those exceeding 5 MB/s stutter buffering.