ok like other stated
wireless lag more the wired.
if it’s not like this is because you block the connection on the wired port in your router or firewall o whatever.
the reason is quite simple, on the cable the signal go in only 2 direction, from the router to the console and from the console to the router, quite simple.
With wireless you’ll have a lot of issue first of all you might have neighbours that steal your connection to prevent it you usually encode the signal with thinks like wpa, wep and so on so you add to every packet you send on the net the time to decipher the packet and to encode it (from the console to the router and otherwise), the wireless signal spread at 360° degrees so is doesn’t go straight to the console. no matter how far tecnology can go a signal who go in only one direction is faster than a signal who go averywhere.
That said if you experience lag with the cable it might as whell be an old cable or a too cable too long. if your ethernet connection is connected with an internet cable longer than 3-5 meters it might experience a little lag or loss of data.
on another note turn off your pc while you play because you probably have installed A LOT of programs who talk on the web with some central server (for example google chrom check for update, an antivirus check for updates, trojan and virus might do think you don’t like on the net and so on) even windows himself talk on the net sometimes (more yes than no) so turn the pc off while plaing.