4K content is lagging / keeps buffering on Roku Premier

Hi,

I’m looking for some advice about my Plex server. Right now I am having issues Streaming 4K content on my 4K Roku premier on my local Plex server. It just keeps on buffering, plays for a few seconds and then buffers again.

My set up is:
All media content on a USB hard drive connected with USB 3.0 to a mini desktop PC. My router and 4K Roku are all in the same small studio apartment Probably 15 meters apart. The file I’m having issues with is 4K transmitting at about 23 MB per second. Other 1080P files which transmit at about 15 MB per second seem to work fine.

Is the issue that my mini PC does not have enough computing power to transmit 4k? Is the issue using the content on a USB hard drive? Something else that I’m not thinking of?

Thanks!

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