Yeah, we&#x27;ve been pretty happy with protobuf in the projects where we&#x27;ve used it.<p>Cap&#x27;n Proto would&#x27;ve been a pretty strong contender if it had existed when we started using protobuf, though.  Serialization&#x2F;deserialization was on the critical path for our server-side code, so we most likely would have been able to get at least a bit of a performance boost out of Cap&#x27;n Proto.