Code review comment for lp:~brandontschaefer/mir/mir-event-capnproto

OK. It isn't really a blocking issue yet. Just keep 'mirping -f' in mind because in the long run if performance is still worse then we need to reassess this approach.

Even a few years ago it was apparent that the Mir protocol created a performance handicap compared to Wayland. So making it even slower again would be a red flag.