Just got installed 400Mb/S (down) internet. I actually get 400, if I hook directly to the Modem (wired, of course). When I connect through my Gigabyte (D-Link) switch I get about 160Mb/s wired. The Gigabyte switch is wired to the router (IQ Router, ver 2).
The IQ Router takes one week to 'optimize' the internet connection (so they say). After one week, It didn't seem to make any difference. Firmware is up to date.