title: Rails 4 and Caching
body: <p>So I was reading this article:</p>
  
  <p><a href="https://devcenter.heroku.com/articles/rack-cache-memcached-rails31" rel="nofollow">https://devcenter.heroku.com/articles/rack-cache-memcached-rails31</a></p>
  
  <p>In it, it says: </p>
  
  <pre><code>Heroku recommends using a CDN to speed up delivery of assets for the fastest visitor experience. If you are already using a CDN, then adding Rack::Cache will not speed up delivery of assets. If you do not wish to use a CDN, Rack::Cache is an good way to speed up asset delivery.
  </code></pre>
  
  <p>I guess my question is whether using any form of caching (in addition to the CDN that we're already using) such as russian-doll caching, would actually speed our application up?</p>