Looking at the single review they link to on the site[1], it looks like the major speedup is due to internal response caching, high concurrency comes from non-t

Looking at the single review they link to on the site[1], it looks like the major speedup is due to internal response caching, high concurrency comes from non-thread-bound connection pooling, and there are a few other niceties relating to Nginx integration. [1] http://www.akitaonrails.com/2014/10/19/the-new-kid-on-the-block-for-ruby-servers-raptor http://www.akitaonrails.com/2014/10/19/the-new-kid-on-the-bl...