raspberry pi 3 plex media server performance

Plex Media Server apparently does all transcoding with the CPU only, there is no GPU offload ( source) it's the VideoCoreIV GPU in the Pi that makes it so good with media, not the CPU, but Plex wouldn't take advantage of that power even if there was a Pi version.

I have serious doubts that the Pi CPU is up to the task of transcoding, especially with HD content. To be honest, one of the great things about Plex is the transcoding: no matter what the client can or can't play, the server can transcode the video into a format and bitrate that the player can accept. It would be up to Plex to release a working version for the Pi as there is no way for anyone else to 'port' it. There are ARM versions about, but they are designed for a few specific NAS appliances and there's no guarantee that they're even compiled for the same ARM architecture as the Pi. Plex Media Server is proprietary and closed source, and does not run on the Pi natively - it is compiled for x86. There was a previous discussion about this.

Raspberry pi 3 plex media server performance