the cable part is unfortunately non-negotiable, the problem is that it would be an "eye sore" to have it running through several rooms, no matter the drilling of walls being needed or not (which in itself separately is also out of the question), nor the cable's appearance unless it is literally invisible
I may try the powerline adapter solution though since it seems it would have same effect as a cable without cable's problems, but I need to check first if disabling those devices changes anything as well, only way to check so far is to try playing like this until I either run into same problems or it just works fine on its own (or more like waiting until I run into same problems, to prove it's not that)
and once again I forgot to mention something, but when there is a problem to specific player, when joining a lobby without that specific player, there is no lag ingame once again, without any changes being done to anything, which makes it look as if the problem is outside this entire area in first place and invariant of its interior connectivity (since it can be lag free even with wireless just minutes after it was lagging, just by there not being the specific player in game that the lag was solely towards), and is also why I don't understand how everyone sees me lagging but not the other player since problem obviously only exists between the 2 of us, like I have to remind people "look how I am not lagging now when this player isn't in game" and they will still think it was solely my problem and dismiss the current evidence of persistent no lag situation
