title: How to profile a Rails request with details?
body: <p>I have a page request which takes more than 12sec to render. i am using newrelic lite to track the performance of this application but, in my case, it's not very useful. It only shows one line :</p>
  
  <pre><code>PagesController#index 0.001  13,030 13030
  </code></pre>
  
  <p>So, not very useful. :) I remember a tool using I think <code>ruby-prof</code> which was good. You provided something like <code>?profiler=true</code> for a request and it gives you all the details with the time spend in method calls (not displaying the actual page in the browser). Unfortunately, I haven't managed to find it again.</p>
  
  <p>Any ideas to have a more detailed profiler per request/page ?</p>
  
  <p>Using : Ruby 1.9.2, Rails 3.1.1, RSpec, New Relic RPM 3.3.0, Mongoid 2.3.3 </p>