title: Why should you delete the 'obj' folder on every build?
body: <p>I'm new on a project and the building is quite slow.
  Now I see as a postbuild event the next action for a lot of projects:</p>
  
  <pre><code> &lt;PostBuildEvent&gt;rd "$(ProjectDir)obj" /S /Q&lt;/PostBuildEvent&gt;
  </code></pre>
  
  <p>I've read that the <code>obj</code> folder keeps track of the builds so incremental builds can be faster, so I thought maybe this has something to do with it.</p>
  
  <p>However, nobody in my team know why this is done, the removal of this folder, so I'm a bit hesitant to just remove the build action.</p>
  
  <p>What can be a reason to perform this action?</p>