I’m not sure how often Fast Paxos is really a good tradeoff, since in the LAN it has inferior throughput to the other protocols I mention below, while in the WA

I’m not sure how often Fast Paxos is really a good tradeoff, since in the LAN it has inferior throughput to the other protocols I mention below, while in the WAN >3/4 quorums expose you to additional tail latency, probably enough to negate the advantage of eliminating a single message delay if clients are distant from the cluster (see the Google SRE book for discussion).