SuperPack uses a binary serialization format meant to reduce the payload size. Compared with several other schemaless formats, according to Shape Security, SuperPack has the smallest payload for a given 4.48 KB sample message. YAML and BSON are more verbose which adds to the overall message payload size. And while JSON is more proficient over YAML, its still considerably more than SuperPack due to its text encoding format. Continue reading this story here.