For some other, newer approaches to improving paxos performance, especially in high or variable latency environments, folks may be interested in epaxos (<a href="http://delivery.acm.org/10.1145/2520000/2517350/p358-moraru.pdf?ip=76.21.61.156&id=2517350&acc=OA&key=4D4702B0C3E38B35%2E4D4702B0C3E38B35%2E4D4702B0C3E38B35%2EC42B82B87617960C&__acm__=1525074612_28ba848f1446421752681bf3485dd21c" rel="nofollow">http://delivery.acm.org/10.1145/2520000/2517350/p358-moraru....</a>) and wpaxos (<a href="https://arxiv.org/pdf/1703.08905.pdf" rel="nofollow">https://arxiv.org/pdf/1703.08905.pdf</a>).