To help in case of a surge of traffic you can enable some sort of microcaching on the web server. For example with a cache TTL of as little of a second you are sure that Wordpress will never see more than 1 req/sec (per page, but usually surges are specific to one or a few pages), and at the same time you will never be serving stale information.
The downside is that your Wordpress installation will not see the requests served from cache, which means so if you rely on a Wordpress plugin for statistics and/or analytics the data will not be correct.
from Hacker News - New Comments: "WordPress" http://bit.ly/2sSMkMe
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