This is a visualization of an HTTP image request, slowed down 40 times. You can clearly see the handshake, slow-start ramp-up and full bandwidth phases.

Created using Packet Flight:

Each flying circle represents a network packet. The small green ones are control packets: ACK, SYN, etc. The larger blue ones are data packets.

The data is from a real tcpdump of a 300KB image download.

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