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If your house was built after 2000 (or has updated wiring) you might wanna look into Ethernet over power. The kits are usually less than 50 bucks (depending on the speeds you're using) and they allow you to hardline your computer without running a cable across the entire house.
The way they work is by plugging a parent box directly into the wall near your router you can run a short Ethernet to the box and then plug in the sister box near your gaming rig and run another short Ethernet from the wall to your computer. It basically just uses the copper wires of the house wiring to transfer the data.
There are some exceptions to be aware of. If you have a particularly large house the speeds might suffer over a long enough run. Or if they have the internet on an entirely different breaker panel it won't work.
I am currently using one at my house. The wire gives me better ping, but slightly lower total download speed. So if I'm downloading a big game or something I'll just unplug the Ethernet at let it download faster over wifi and then I switch back to wired for gaming.
I wish there was a way to test this without spending 50 bucks. My results have simply been that the resulting signal is just as unreliable as WiFi.
I did in my house which was built in the 1950s or 60s and it works. With that said, it was only ok and I wouldn't use this for anything but internet access and some light streaming. This was 10 years ago so it is possible they have gotten better. I have since moved to mesh wifi and it literally solved every issue I had and the whole house has incredible wifi no matter where you are. Plus I use the AP's to plug in my more dedicated stuff since it's faster than wifi to use the backhaul the APs use to communicate with. I do wish I could afford to redo my house and put in ethernet wiring everywhere and have a dedicated switch for everything.
I used to use a powerline adapter in a house built in the 60s and it worked great.
Yeah they can work on older homes but I find they tend to work better in newer construction
Be aware though if you use DSL: the frequency of the Powerline devices will most likely match and disturb your (in most cases) unshielded two copper wires over wich your DSL Signal is transmitted
Though this also depends wich DSL Variant you are using.
For example Super Vectoring - 250k Down /40k Up will have troubles in most cases to uphold packetloss to a minimum.
All of this is ment to be a thing with DSL Speeds over 100Mbit (at least in Germany).
Source: I am an IT dude, had DSL Problems, Telekom Technichian was sent out and I talked to him about the causes and such.
To add some non-text source:
https://www.youtube.com/watch?v=ywQeJCa3jl8
LTT Quick Vid about Powerlines and how they work.
When I used one of these it jammed the wifi
I have never had that issue. I would have been very curious to try and trouble shoot that. Was it older house? Plugged in near the microwave?
Older but not too old. Not near the microwave. There was a problem with the WiFi not penetrating a wall well so a WiFi extender on the other side connected to Ethernet over power was supposed to fix that. But that turned out more unreliable than before. In the end a WiFi mesh network worked the best.
Mesh networks are pretty hard to beat. Especially for houses with walls that aren't kind to wifi.