My connection speed says 11 or 54 Mbps; why is my data transfer rate slower?
In the 802.11a/b/g protocol, the connection speed rate encompasses all data transfer, including necessary administrative exchanges that take place between the Wi-Fi card and the access point. This slightly lowers your actual data transfer speed (“actual” data refers to the visible data, for example, actual data might be the e-mail message you are sending or the web page you’re viewing).