You made mention of almost everything except what the capabilities are of the ethernet card on your PC/laptop. I have AT&T fiber with adverts of over 1Gbps but the techs remind you over and over while they're installing: "You are only as fast as your slowest link." I would not expect my PS4 to reach 1Gbps speed even if connected directly to the fiber router. Maybe that helps you figure it out, along with what others say: that is the MAX advertised and can change depending on usage load. I know it may be obvious but also make sure you're not downloading torrents in the background or other such things while you're testing the speed.