After the cable directly from the UPC router, the speed is about 100mb / s +, i.e. it is approx. The problem appeared when I installed the TP-link router (TL-WR841N) between the UPC router and the PC computer, which has "N" technology (300mbps) - Speed over the cable from the router Tp link is now max 32mb / s, and after wi-fi 21mb / s
It looks like the TP Link router is limiting the speed considerably. I note that I configured tp-link automatically according to the manufacturer's instructions.