Here’s i7-9700k CPU usage while transcoding a 37.5 Mbps 1080p BluRay rip to 10 Plex Web windows playing back at 1080p 10 Mbps:
And that is after seeking to different spots in all the players in case there is any sharing of the transcode buffered files.
Here’s after I killed all the streams for an idle reference point (any load on the couple of cores is likely coming from the RDP session):
