Abstract
TCP slow start is defined under RFC 2581 which is one of TCP congestion control algorithms. TCP congestion control has four phases which are slow start, congestion avoidance, fast retransmission and fast recovery. In this paper, the focus will be on the slow start phase as it is the first phase that TCP has to pass in order to start the transmission between sender and receiver. The paper is representing relative researches on slow start algorithm and comparing the results with the alternative algorithm in order to show how it can speed up this phase.