I have a mi box but I'm thinking of returning it to walmart and grabbing an Amazon fire tv 4k box. Wondering If the fire tv would perform streaming high bitrate files from a remote server better than the mi box. The mi box does okay, but you cant hardwire it. I assume the fire tv can perform better especially with it hardwired, right?
High Bitrate 4K Bluray Rips playback needs Gigabit Ethernet hardware to stream over a home network. If you do not have that forget about reliable 4K BD streaming.
The best Plug N Play device for 4K BD Rips is not even an Android device, it's the Apple TV 4K, running Infuse or MrMC Apps. Both of those Apps direct play anything from a Plex server.
The following thread has a hell of a lot of info:
https://forum.kodi.tv/showthread.php?tid=332180
Cheap hardware will not give you what you are looking for. You have to bite the bullet and buy something decent that is well supported.