1) How fast is your internet
2) ROUTER MODEL NUMBER! I mean comon how do you expect us to help with that kind of info?
3) Are you testing wireless or wired. Wireless it depends on what version of wireless and what band. Wireless N or less on 2.4 Ghz will hit about 70-80Mbps max usually. Wireless AC on 5Ghz I have tested to get the FULL speed at the faster connection I have personally tested on a 300Mbps internet connection.
Also if you are using a non gigabit router with something over 100Mbps, so like if you have 300 Mbps but the router only does 100Mbps with over heard you will see about 60-80 mbps depending on the router.