When playing uhd movies Plex is buffered

Hello, I have a contracted plex pass, I have a computer with the following characteristics

i7-7740x 4.3GHz
Moba MSI Tomahawk x299
16GB RAM
NVM 512 SSD
Zotac RTX3060

1gbps internet

and when playing my UHD movies on my LG TV UJ6850
it is constantly in buffer.
What could be causing this?

my TV and my computer are connected by network cable

Server Version#: 1.22.3.4523
Player Version#:

Without further details… this could be many things.
Let’s start with verifying if your TV’s LAN port supports 100 Mbps or faster bandwidths – 100 Mbps might not be fast enough to stream 4K content reliably.

Beyond that… your CPU seems to have a PassMark score of approx. 11850. That’s a good score but not fast enough to transcode 4K content, e.g. if your TV cannot deal with the media as-is (sometimes this can happen if your TV doesn’t support a certain codec or a combination of codecs in your files). You’ll need a PassMark score of 12000 to transcode 4K SDR content. For 4K HDR content you’ll need a score of 17000.

See What kind of CPU do I need for my Server? | Plex Support

If you have enabled hw-accelerated streaming, your GeForce RTX 3060 should be able to handle the transcoding for you – however there’s use cases where the GPU cannot do that (e.g. when it comes to burning subtitles into the video stream.

See Using Hardware-Accelerated Streaming | Plex Support

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