I agree with the general point that you might be over-smoothing if you graph data with large window sizes, but you don't have to change the units on the graph as well, and probably shouldn't, since "Mbit per half second" is a confusingly nonstandard unit--- the units of measurement and the granularity of measurement don't have to be tied. An Mbit/s is a rate, and you can graph the rate in that unit for data points taken over a window of 1/2-second also.
Same as how in physics, lots of things are expressed in rates of "per second", but this does not necessarily imply that the measurement window was one second; it might be vastly larger or smaller than that. Or, with cars, you can measure the speed in mph or km/hr much more frequently than once per hour. =]
Same as how in physics, lots of things are expressed in rates of "per second", but this does not necessarily imply that the measurement window was one second; it might be vastly larger or smaller than that. Or, with cars, you can measure the speed in mph or km/hr much more frequently than once per hour. =]