C2S needs no buffering, your client cannot generate the kind of traffic which would warrant it ... obviously it would be a server only thing, and it would only affect people whos connection could not bear the load otherwise. History based compression doesnt always model the data well, for the timestamps and position for instance delta coding will work better ... does that 30% include the IP&UDP headers? BTW will packets finally have individual identifiers in the new protocol? (This doesnt need a lot of extra bits, only packets with identical timestamps need any extra data ... on average it would probably be pretty negligible.)