Despite the end of the Internet bubble, operators continue to increase the capacity of their networks. The question application-application application * * * * n (0senaler) v -, _~~~~~~~~~~~~(i&eiver) layer now rises whether these improvements still result in faster d ei communications, or whether most flows are limited by other aspects. In order to answer this question, actual network traffic TCP TCP TCP needs to be analyzed. Therefore, in this paper methods are S~~~~~~~~~~( sendleA(rcier)

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... r proposed to identify the factors that limit the speed of TCP flows. Three main categories will be distinguished: the network, the TCP buffers and the application layer. Our proposed methods network have been tested on real traces; in many cases it turned out that ( ] . ].. .. P~~~~~~~~~~~~~~~~~~~~~~~~~( network lazzer: lifnk the network was not the limiting factor. network