Saying that reducing 50% of a 30 bytes message reduces 50% of the client-server exchange traffic is misleading (and wrong). The average HTTP header is around 7

Saying that reducing 50% of a 30 bytes message reduces 50% of the client-server exchange traffic is misleading (and wrong). The average HTTP header is around 700 bytes plus 40 bytes of TCP/IP header. Since its gains diminishes with more data (MsgPack seems to focus on the structure of the message), I imagine the real gain will be between 1-2% of traffic. The extra complexity is simply not worthy.