Every high traffic site leverages caching to some extent, no matter what language they run underneath. That may be varnish reverse-proxy caching, in-memory cach

Every high traffic site leverages caching to some extent, no matter what language they run underneath. That may be varnish reverse-proxy caching, in-memory caching, fragment caching, browser caching, or most likely a combination of all of them. Caching is by no means limited to Ruby or slow languages.