Need to test with a wired PC and use a speed testing site like speedtest.net or dslreports.com.
Testing speed over wireless isn't good since many variables in wireless effect it's performance.
"Maximum wireless signal rate derived from IEEE Standard 802.11g and 802.11n specifications. Actual data throughput will vary. Network conditions and environmental factors,
including volume of network traffic, building materials and construction, and network overhead, lower actual data throughput rate. Environmental factors will adversely affect
wireless signal range."