In one rooom I have one PC with a router next to it. It’s connected via LAN. Then I have another PC in another room. The distance between a router and the 3nd pc (in a straight line) is about 6 meters. That room is on the adjacent wall. Up until now I’ve been using a Strong’s AP300 wifi repeater but I get high oscillations in download speeds and ping. Other than directly connecting my 2nd PC to the router via LAN, are there any other solutions you would recommend? Below is a drawing of how my situation looks like. I would try to avoid connecting it via cable as then i would have to drill through multiple walls.
I have powerline adapters and they do their job fairly well - children are not complaining while playing online games (as opposed to when they did over wifi). Bear in mind those adapters claim they support say 600 Mbps but then the ethernet socket will support only 100 Mbps as the 600 is related to the traffic between the adapters only. It works, ping is ok, for quick transfer of large files not really suitable.