That is why you would use a caching proxy like Varnish (or Squid) and/or a web-server cache module like mod_cache (Apache) for. Using either of the above, you'

That is why you would use a caching proxy like Varnish (or Squid) and/or a web-server cache module like mod_cache (Apache) for. Using either of the above, you'd reduce the latency and increase the through-put of WP to the likes of hosting a simple HTML page on nginx. The picture gets a bit more complicated with the back-end admin area, user logins, sessions, dynamic page parts, etc. And there are ways to either handle it or just bypass the caching layer for it, but for handling reader traffic, caching is the key regardless of which CMS you use.