Direct Play buffering on remote connections

Server Version#:1.47.1.3086-6c3d964f
Player Version#:
For the past 4-6 months 2 of my who use my server have been having trouble with 4k in general but mostly remuxes. I’ve had ATT fiber 1gbps for few years with no problems. I switched to the 2.5 gbps plan less than a month ago seeing that would help but no luck. They swapped me to the new bgw320 modem. Locally my remuxes play without problems on my XSX

Setup:

2.5 gbps ATT fiber (speedtest Dl:2200 mbps Ul: 2300 mbps consistently)

Latest Plex media server on Windows 11

i7 8700k with 16gb ram and GTX 1080ti

Connected to my NAS that holds all files

Both Friends Setup(direct playing)

1 gbps fiber internet

Xbox Series X hardwired getting full speeds

One has the Shield tube 2019 hardwired getting full speeds

Things I’ve tried:

Directly connected to modem
Behind a router in IP Passthrough (current setup)

UPnP & manually specified port (32400)

Upgrade from W10 to W11

I’m not sure what else to try but one thing I did notice on the Plex dashboard is when a 4k remux is being played the upload speed seems to stay at a constant 13-15 mbps which is obviously not enough. Other users sometimes get up to 60 mpbs on 1080 when first starting so I’m not sure why the 2 having problems are being stopped at <15. I would have another user try but no one else has the right setup or internet speeds for 4k remux direct play.

What do your friends have set as remote quality level in their settings? Can you confirm it’s “original.”

Yes Ive confirmed with them everything is set to original. Also on Plex dash & tautulli both show direct play

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