High CPU usage with plex

[ed]

I would recommend copying those movie files on the USB stick and connecting that to the TV just to find out if your TV supports those videos and do not require a transcoding feature. Synology plus series models can not transcode 4k in Plex only in their own video app. Also, go to Plex setting and make sure transcoding is disabled, this would avoid unnecessary transcoding if TV can play original files. You may need to stream those videos via DLNA instead.

I hope this helps.