If I might respectfully offer a different opinion, gaming over wifi is eminently possible if the wifi is working well, and in my observation the additional few milliseconds overhead of a wifi connection are nowhere near enough to cause frequent problems. So, whilst we haven't ruled out a wifi problem, my first thought is to check out the broadband. In my tests, wifi added between 3 and 10 ms to latency, and that's not going to be enough to even be perceptible. Competitive gamers will reasonably attempt to systematically reduce latency at every point within their control, and would involve addressing all the other gaming factors, like minimising other use on the same connection, high end kit for high FPS, high refresh rate monitors, and using Openreach in preference to VM due to the latency limitations inherent in cable. That's all a bit different to the needs of the rest of us.
@juliemaddison can you try the following for me: Setup a Broadband Quality Monitor as that will show what's going on with your VM cable connection. Post a LINK to a LIVE, SHARED graph here (not screenshots, not a link to the chart you see when logged in) and we'll be able to see if there's a problem with the cable connection. Usually needs to run for 24 hours before we can draw reasonable conclusions, but the live graph will continuously update so you can post the link immediately. This may or may not give an obvious answer, most likely it will lead to some further questions, but if you'll persist we can probably come up with a solution.
