It is completely normal, but BS. I have a 150Mbps down 20 Mbps up connection from Cox and all of my wired devices get full speed and often more from my connection. My wired PS4 maxes out at 32Mbps down and 15Mbps up no matter what. It may be a driver issue, actually crappy NIC issue, or Sony may have a speed cap (not likely on the NIC itself). The built in Network test is going to be about the speeds you can expect from SEN with downloads. I even tried connecting my modem directly to the PS4 with no change. The wireless connection on both the PS3 and PS4 are even bigger jokes.
UN65F9000AFXZA + SEK2500U/ZA firmware version 1162.2
Denon AVR-X5200W, Apple TV, Sony BDP-S6200, PS4, Xbox One
(2) Klipsch RF-82IIs, (2)RS-62IIs (4)RS-52IIs, (2)RS-42IIs, (1)RC-62ii, (2)RB-61IIs
(1) SVS PB12-Plus, (1)Emotiva XPA-100, (1)XPA-200, (1)UPA-200,
UN55HU8550, AVR-S900W, Ceton Echo, Apple TV, Panny BDT460, PC,
(1)Klipsch G-42, (2)G-16s, (2) Bose 161, (1)BIC Acoustech PL-200