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There is absolutely nothing wrong with powerline if your wiring is up to par.
As long as the wiring is up to code from the 1930's it's no trouble at all.
Wifi was also pretty bad until I got a single UniFi AP-AC-LR access point, nearly as good as wired performance for just over $100 (good read over at ars about unifi here[arstechnica.com]).
wifi
wired
So I am getting about 500MB/s from my Wifi AP, which is ok (1/2 of gig speed) however the reliability and latency are very rock-solid and gaming on it is no problem at all. Getting gig speeds is worthless if you get packet loss and stuttering as I was on PL.
As for actual facts i remember multiple test where the Powerline underperformed, even behind wireless. This is why i specifically mentioned gaming. It sure is fine for internet use.
https://www.pcgamer.com/heres-how-playing-on-wi-fi-hurts-your-game/
and even a user https://linustechtips.com/main/topic/445640-the-powerline-is-low-latency-myth/
Have i ever found anything that would suggest to use Powerline for gaming? No.
But i would like to see it happen as that techology has advanced over the years.
There will always be issues with an unshielded Powerline simply because the wires are dedicated to something else and only shared with it. All while a shielded twisted pair Category 6 cable, designed and built for data transfer, serves only 1 specific purpose. But maybe you can proof that your power cables are protected against magnetic fields and specifically certified for data transfer with zero interference.
My elecrcal setup also has two boxes. If there are issues with the powerline ethernet, it was either a defective unit, or your box is not up to code. In both cases where I grew up and where I live now the electrical boxes dated back to 2009 and 2016 respectively. The system works best as a repeter line....which is what the OP might need.
Excpet that there really is nothing worng with it for gaming. Powerline has way less poin to point latency to the server than WiFi, and carries more bandwidth.
Ping latency through WiFi using my phone for WiFi averages about 48ms because it has to send a signal to and from a pair of trancivers and recievers before being places onto a NIC circuit. Wired connetcitons always have lower latency results. It takes less time to repeat a signla than it does to send, recieve, then send again through two differnt means of networking.
However, if I use my laptop with a powerline option ont he opposite side of the house where my router and modem are, I can average about 12ms Ping laterncy to the server.
Use this for testing.
http://www.speedtest.net/
How i understand this is that in your scenario Wi-Fi (2.4 or 5 GHz?) is underperforming because it is not optimized for your location, thus the Powerline is the option of less resistance. That is a reasonable decision but does not directly compare the performance of both. And even with that in mind, the typical issues coming with Powerline are not mitigated.
http://www.speedtest.net/
Test conditions are a wireless N 750 router with a 2.4GHz signal because 5.0GHz is a smaller range. Said router has gigabit ethernet ports on it.
Modem is a Netgear CMD-31T Cable Modem and has DOCSIS 3.0...
ISP speed is 100 Megabits downstream, 12 megabits upstream.
Powerline set I have is not wifi capable...TPLink TL-PA7010 kit.
The Wirelss conneciton is set to 130 megabits and obviously encrypted. (encryption and decryption can cause latency...and it is a standard default stting for SOHO LAN's)
The cables used ar CAT6au RJ45 ehternet cables because they are the only ones that have grounded electrical power (I am not a dummy)
As long as the rooms are on the same floor, the OP might be able to get away with even a 25m ethernet cable... so I'll go with suggesting just routing ethernet cables.
For example i have a CAT6 ethernet cable connecting my PC to the router. When i run a test here
http://www.dslreports.com/speedtest
i get a decent A Grade for Bufferbloat (Ping 23-32, A+ Quality). Since my ISP is not deploying any specific fast routing.
However since we are talking about local network, and to factor out external causes, i also watch my connection from PC to router.
When i ping the router 100 times the results show nothing less than an average of 0 ms:
- Packets: Sent = 100, Received = 100, Lost = 0 (0% loss),
Now when i do the same during a full speed download/upload/ping test i get the exact same result:Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms
This is what i would consider a "best case scenario". And that alone is a strong indicator that my local network can handle the internet traffic, no matter what happens outside, and why i recommend actual network cables.
This does not mean that the other connections should not be used. It is just more about for what they are supposed to be used. And with gaming, any type of higher ping or delay like bufferbloat might not only ruin your experience but also the experience of others.
I thought I could get it to work better by getting it on the same bus at least, but even breakers on the same bus suffer problems and only the same breaker allowed it to work without problems, so it's useless in my situation.
My greatest surprise was the low latency from the UniFi AP, was completely unexpected. I barely see a 1ms latency penalty. Game on!
I'm afraid it is not true. I have AC and does not have issue. Again, regarding to security, not true. It has better wifi security than before. That is reason we don't use WEP any more, it is WPA. So you have to keep update at all time.