title: `bundle exec` very slow
body: <ul>
  <li><p>Ruby version:</p>
  
  <pre><code>ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]
  </code></pre></li>
  <li><p>Bundle version:</p>
  
  <pre><code>Bundler version 1.7.3
  </code></pre></li>
  <li><p>Rails version</p>
  
  <pre><code>Rails 4.1.5
  </code></pre></li>
  <li><p>System is Gentoo in Vagrant</p></li>
  </ul>
  
  <p>When I execute command <code>bundle exec annotate</code> :</p>
  
  <pre><code>Nothing annotated.
  bundle exec annotate  4.33s user 54.82s system 46% cpu 2:08.45 total
  </code></pre>
  
  <p>Rake command is very slowly too，for example <code>bundle exec rake db:migrate</code>:</p>
  
  <pre><code>bundle exec rake db:migrate  4.31s user 55.93s system 53% cpu 1:51.99 total
  </code></pre>
  
  <p>I found the question <a href="https://stackoverflow.com/questions/13894966/running-scripts-with-bundle-exec-is-slow">running scripts with bundle exec is slow</a>, but when I execute the command <code>time bin/rake db:migrate</code>, it's very slow too:</p>
  
  <pre><code>bin/rake db:migrate  3.58s user 49.47s system 45% cpu 1:55.34 total
  </code></pre>
  
  <p>So can anyone tell me what's wrong happened?</p>
  
  <p>Thanks</p>