Fire TV Stick 4K will be very slow connecting to any remote server

Hello everyone, may I ask why two of my Fire tv stick 4k both have a slow connection to a remote plex server?

Here’s the detail:

----the remote server’s upload is stable 100Mbps

----the remote play video quality is set to MAX/Original on all client

----Both servers and all the clients are up to date version

----the connection from firestick to the remote server is forever under 25Mbps

----when I run speedtest on the fire tv stick, it shows 300Mbps+ download, connected to my home wifi which is 440down/20up at 5GHZ

----when I play movies with fire tv stick from my local plex server, the connection speed can reach 100Mbps

----when I play movies with Nvidia shield or apple tv or iphone/ipad from the remote server, the connection speed can reach 100Mbps

----all the movies are under direct play, no transcode, bitrate is from 20Mbps~130Mbps

Please help! Thanks!

Need to elaborate more.

Does the video playback on the Firestick fail while playing remote content?

No, The test file is around 85Mbps, The fire tv 4k was buffering a lot. I can see the connection speed on the remote server’s web control panel, never exceed 25Mbps.
And it was doing fine when I played same video files on my local plex server. The connection showed around 85Mbps.

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