I have a Xiaomi Miwifi 3G router which is rated at 867Mbps for AC 5G connection. I am using Edimax EW-7822ULC adapter which is also rated at 867Mbps for 5G AC connection.

But when I am transferring files within the LAN (from a PC connected to the router with a LAN Cable to another connected using the Edimax EW-7822ULC on 5G) I am only getting about 7MB/s.

What could be the problem here? Any recommendation to fix this?

Is this any good?