Wind,
the 1000 foot picture of the dynamic struct stuff is that every packet is given an internal representation that the application logic uses. That packet is then sent to a structure strategy for the correct patch which is responsible for turning the internal representation into the correct EQ representation for that patch. Which basically boils down to an extra slightly-less-cache-friendly memcpy per packet. This is further helped by the fact that almost all packets currently work for both clients, so no translation at all is done on them, this advantage will slowly go away as clients drift further apart.
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