uber-nerd here bandwith works simple in the effect of how much information is accessed on the server. example is the long wall of text or even large images in the sig line or avatars them selfs can be any bit ot byte on the ecf server. things stored and accessed else where are not effecting ecf load that much. bandwith of corse is both ways up and then the later downs.
this is the wiki information on the subject
In computer networking and computer science, digital bandwidth, network bandwidth or just bandwidth is a measure of available or consumed data communication resources expressed in bit/s or multiples of it (kbit/s, Mbit/s etc).
Bandwidth may refer to bandwidth capacity or available bandwidth in bit/s, which typically means the net bit rate, channel capacity or the maximum
throughput of a logical or physical communication path in a digital communication system. For example, bandwidth test implies measuring the maximum
throughput of a computer network. The reason for this usage is that according to Hartley's law, the maximum data rate of a physical communication link is proportional to its bandwidth in hertz, which is sometimes called frequency bandwidth, radio bandwidth or analog bandwidth, the latter especially in computer networking literature.
Bandwidth may also refer to consumed bandwidth (bandwidth consumption), corresponding to achieved throughput or goodput, i.e. average data rate of successful data transfer through a communication path. This meaning is for example used in expressions such as bandwidth shaping, bandwidth management, bandwidth throttling, bandwidth cap, bandwidth allocation (for example bandwidth allocation protocol and dynamic bandwidth allocation), etc. An explanation to this usage is that digital bandwidth of a bit stream is proportional to the average consumed signal bandwidth in Hertz (the average spectral bandwidth of the analog signal representing the bit stream) during a studied time interval.
ore on that and much more at wikki and here
How Much Bandwidth Do You Consume Per Month? - And are you willing to be billed by the byte? - dslreports.com