It is obvious.
And? Do you have any movie with 1000 mbps?
I don't really understand that fuss about network bandwith.
The biggest UHD BD (Lalaland) has about 80 mbps.
Normal 4k content has much lower bandwith.
If you want to play all the extreme test videos then connect a gigabit adapter for the S905X box.
I'm taking about Ethernet speed.
I suppose you use USB extension to "upgrade" Ethernet port on Android box 10/100 Ethernet to gigabit, right?