SSH shell typing lag when server's using wireless

I've just setup initial archlinux installation, started opensshd with default setting without modifying any configuration.
First I've enable netctl-auto to use wireless connection (11n 5Ghz) in archlinux, after that I've connected ssh shell using my 2 machines (1 wired, 1 wireless) and observed noticeable typing lags in remote shell regardless of connection client uses. As soon as I replace wireless network to wired one on archlinux those problem goes away completely.
Suspected basic thing such as network load, or latency but there weren't significant differences between wired / wireless, not sure why only occurs when server uses wireless connection.
May I possibly ask for some help to find out any clues?

@Trilby - Interesting, actually there are more than 10 devices are connected via wireless to my router but in my case I haven't experienced any other perf drops other than this issue.
@firecate53 - Thanks for suggestion. Before posting this I also tried Mosh with MobaXterm as client (client system is windows) which did not show any big differences. Cas of power saving I didn't thought in that way at all, will take a look.

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