Not trying to start a flame, but what is the difference between wifi and wired, considering my 800Mbit ac router is in the same room as my ps4 and it uses 5GHz range, so there is no interference from neighbours either?
Well, I will make it very simple for you.
Plug your pc or your PS4 directly to your modem with nothing else connected.
Do 3 speedtests on your ISP speedtest site or Ookla.
Then connect on wifi like you normally do and do the speedtests, 3 of them and compare them.
How do you know that there is no interference? Do you run wireshark and walk around your house?
5Ghz is not a magic bullet, many things use it. Some cordless phones use it, some wireless speakers use it
I work for an ISP and it is the #1 most irritating thing I used to have to deal with when I did residential.
Me "Are you hardwired to your modem"
"What does that matter"
Me: I will explain as we go
"It is connected like I always have it
Me: "You did call because you are having issues right?"
"yes"
Me: Those issues are happening while it is in its current configuration?"
"uh I guess"
Me: "Progress" so are you hardwired to our modem..?
"No"