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In my testing this reduced the login process by 105kb for vanilla clients. It's not nothing, but it also won't magically fix your networking lag. My hope is that this can help some players with really bad internet connections, and maybe even mitigate some issues with the 2mb packet limit.

This only changes the encoder, the vanilla decoder can already handle this. This should maintain compatibility with a wide range of clients and servers. My mixins may be a bit brash but they seem compatible with the ATM 10 mod set at least.