Sending game snapshot state as deltas is pretty interesting as initially thought they were sending actual diffs of snapshot but they just mean they're not sendi

Sending game snapshot state as deltas is pretty interesting as initially thought they were sending actual diffs of snapshot but they just mean they're not sending all state at once and from the bitpacking section it looks like they're using some kind of custom binary format. The reason they're deltas is that even though they're using UDP, deltas only work when you have the previous snapshot and so they require acknowledgement of the delta, something you don't get with UDP by default. Even the compression is custom. Extremely small message sizes was really important to them.