Fire TV Stick 4K connection Slow to a remote plex 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!

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