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Slow start happens during several scenarios:

  1. When you start a connection
  2. When you experience a Timeout

In this initial phase we increase the congestion window for every packet that is ACKed.

| packet # ACKed | Congestion Window | | 1 | 2 | | 2 | 3 | | 3 | 4 | |...|...|

The results in an exponential growth

| Number of packets sent | Congestion window size |

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