title: Bootstrap-sass Gem v.s. CDN
body: <p>Various Ruby on Rails tutorials encourage the instillation of the bootstrap-sass gem. Why is this a convention rather than point to a CDN?</p>
  
  <p>I've included in header of my app:</p>
  
  <pre><code>  &lt;!-- BOOTSTRAP CSS 3.3.5 CDN: --&gt; &lt;link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"&gt;
  </code></pre>
  
  <p>And in the footer:</p>
  
  <pre><code>  &lt;!-- BOOTSTRAP JS 3.3.5 CDN --&gt;&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js" type="text/javascript"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Assuming I am always working from a development box that is connected to the internet: What is the reasoning behind using the bootstrap gem rather than just pointing to a CDN?  Isn't it always faster to point to a CDN where a client is likely to have the file already cached?</p>