By using Traffic Shaping cFosSpeed continuously keeps track of the current line speed (receive and send). You can always switch on the line speed display in the Metro skin, so you see the bandwidth which was available for the last download and/or upload. To determine the current maximum speeds, you can download or upload a big file an see how these values change. So you alays stay informed about the current speed of your Internet connection.
We are currently working on a solution, so cFosSpeed conducts a measurement for the maximum connection speed automatically. Until then, the above method gives you a quick way to determine your bandwidth.