When I wired my house over a decade ago, I used keystone jacks, which were a knockout for the best Cat 5e at the time cables required. I had a couple of jacks that didn't connect at full speed. When I saw them I decided it was worth a try. I tried another brand from another supplier and had to return them when they didn't work properly. With them, my network speed is where it should be. They were cheap and delivered quickly.