Not sure if I should be making a separate post for this, but considering I already have some context about my setup here, I hope it's okay to continue in this thread instead. This assumes that the upstairs and downstairs are on the same electrical system if you have separate power meters it will not work. This will use the electrical wires as ethernet. Your second best solution when you can not run ethernet is run powerline units. It actually intentionally transmits a interfering signal on the same radio channels as the main router.

You are likely running the second router as a repeater which will even in best case reduce the bandwidth by 1/2. You are much better off using a wifi card directly in your machine. This is why it is never recommended to play online games on wifi. Any other application is not affected much unless the signal is very weak. In general the only people that seem to see problem with this are gamers. It can be fine one day and unusable the next. Can be cars with wifi hotspot driving by. Can be someone walking around the room changing the signal pattern. Wifi is one of those things that is almost impossible to troubleshoot since so many things can affect it. I'm happy to answer any questions, and I appreciate the help!

Heck, maybe I just have to wait a few days and the problem will resolve itself, but who knows. I assume the next steps would be prioritizing my PC on the network or contacting the ISP, but before I do so, I just wanted to make sure there isn't anything I may have missed. Ensuring I'm in the correct server region for games. Tracert to Google, but I couldn't find any consistent culprits. The 2nd router reboot seemed to lower my ping to double-digits, but it bounces around from 20ms to 90ms and things are still very jerky and unstable in-game. Here are some additional fixes I've tried: The only factor I am aware of that changed from when things were working perfectly was one extra person moved into the house above, but I can't imagine that's the issue as my down/upload speeds (and ping during speed tests) has remained unchanged and stable. It would hover at ~90ms, drop to 40ms and then skyrocket to well over 300ms. Yesterday, however, my ping became very unstable. For the first few days, things were fantastic, I was getting a stable ~30ms ping in games and I had download speeds of around 10mb/s.

The wifi signal was quite poor in the basement, so I set up my router (Asus RT-AC1900P) to act as a relay, then connected my devices to that wifi signal instead and wired my PC directly to the router. I live in a basement suite and I use the same internet (provided by Videotron) as the people living upstairs.

What is a fast download speed