Are you on wireless? Do you know if you are on wireless G or N? PC/Macs will give you the speeds of the wifi connection in the status info.
Wifi speeds are in Megabits per second, bit Megabytes. So a 24 megabit per second conenction is a 3 megabyte connection per second.
Are you worried about internet speeds? 1st check your ISP service. What speed should you be getting from them. Next, use an online speed tool like http://www.speedtest.net/ to verify you are actually getting your speeds.
Are you running any apps that access the internet constantly. uTorrent? Did akamai sneak their stupid peer to peer tool on your system? These all take bandwidth.