Store entity ID for position ticks in a 1000 sized cache - reduces entity ID from 8 -> 5 -> 2 bytes (8 now, would be ~5 with VarInt encoding, 2 bytes with index lookup) - also compresses the parent's network ID when parented - overkill just for network IDs but basically free since we also want to do lossy compression for positions - demos store the network ID lookup in the keyframes so it can skip forwards & backwards still - make batch position packets ordered now (not a big deal since they are way smaller than old ones and max one per server frame)