if you have only one wall between your PC and the router, get a router with 5Ghz Band(but your wifi card must support that too).
It's faster, but more importantly, it's unlikely that the band is used by surrounding neighbour wifi's, but even if it was, it has more channels available to not interfere with them.
proper setup is important for wifi anyway(antenna position of both the wifi card and router, and to use the right channel).
i have setup mine to get 100 points in the program "inSSIDer":
there is no difference now compared to a connection with cable.
BTW, i use still the 2.4Ghz band, but kept out interfering wifi's with how i positioned the wifi card antenna.
there is no difference now compared to a connection with cable.
you really were able to push it to consistent <1ms to your local internet exchange node? The best I would ever achieve on wirless was solid 4ms with 5-10% at ~15ms.
well, consistent 1ms to my router(ping 192.168.1.1), through one floor.
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router: Asus DSL-N12E_C1 (might update to dual-band, but this one is already much better than my old >5 year old Siemens router, which wasn't as stable, unless you also connect some 20m networkcable too, which must have worked as some sort of extra antenna :D)
wifi-card: Asus PCE ac56 (thought my old card had issues with win10, but it was a software issue with "netbalancer". My old card was already sufficent, with atheros AR5006g chip, and external antenna with 1m cable).
flat, although not in a big city, so the surrounding wifi's are limited.
If i had positioned the antenna different, i would get about 4 more wifi's visible, and those already showing with more signal strenght.