Slow Speed while Transcoding Media for Download to devices

Server Version#: 1.27.2.5929
Player Version#: 8.5 (IOS), 1.48.2.3124 (Win10)

Hello guys,
I do run a Plex Server on a synology DS920+. I download Media to an IPad Pro for offline watching on long range flights. The problem is, when i need to transcode, the speed is around 30MBit/s while the server load is 20%. If i download directly without transcode, i get ~500MBit/s.
I tested that also with the Win10 Desktop App (Lan plugged). Same behaviour.
The server is running in a docker container. I do get HW-Transcoding (tested with transcoding a movie while watching it). The speed is on the same Level with the Native DSM 7 App
How do I improve the speed? The NAS could provide way more processing power.

As you can see, the transcoder threads barely use any ressources

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