title: How to minify JavaScript & CSS using Rails 4?
body: <p>I'm currently using Rails 4. My settings:</p>
  
  <p><strong>production.rb</strong></p>
  
  <pre><code>  # Compress JavaScripts and CSS.
    config.assets.js_compressor = :uglifier
    # config.assets.css_compressor = :sass
  </code></pre>
  
  <p>My understanding is Rails 4 is supposed to minify JS and CSS however when I run Page Speed Insights, I'm being told I need to minify my JS &amp; CSS. </p>
  
  <p>What am I doing wrong? How do I get my Rails 4 app to minify JS and CSS and make Google PageSpeed happy? </p>