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Since the TCP transmission rate is low during the startup phase, the QoS of various applications is seriously degraded. To improve the TCP transmission rate in the startup phase, many fast startup algorithms have been proposed. In this paper, we evaluate the fundamental performance of fast startup algorithms. Specifically, we focus on the initial window size and Rate-Based Pacing (RBP) start method, which is employed by many of fast startup algorithms. Through the simulation experiments, we first compare the performance of the RBP start method with that of the normal TCP. We then derive a way to set the initial window size for fast startup TCP algorithms.