Gags in the home network: what could be the problem?

Question

Computer networks

Good laziness.
There is a home network. Router Asus RT-AC68U, a computer, NAS Synology DS-214+, Dune HD D1 player, plus several devices via WIFI are connected to it by wire.
When copying from a computer to / from Synology, the speed was about 100 Mb / s, copied by far. But when copying from Dune to US or a computer, the speed is about 3-6 Mb / s.
There seems to be no network settings in Dune, what was - looked through and configured.
What could be the problem? Will it be solved if you put a gigabit switch? Or is it already a Dune problem?

Answer 1

It was decided by installing a gigabit switch.
Now even "thick" BDs look no problem with NASa.

Answer 2

Most likely there is not enough processor for Dune.

Answer 3

Dune is a rather weak piece of iron. The problem is in it and just like that you will not solve it.