title: Speed up a MongoDB find() with better sorting? (using mongoose orm)
body: <p>Right now I have something like this....</p>
  
  <pre><code>Item.find({}, function (docs) {
      for (var i = docs.length-15; i &lt; docs.length; i++){
       client.send(JSON.stringify(docs[i]));
      }                   
  });
  </code></pre>
  
  <p>but it seems to be very slow. I'm hoping to speed it up by doing something like...</p>
  
  <pre><code>Item.find().sort({_id:-1}).limit(15)...?
  </code></pre>
  
  <p>Is this possible? Will it help?</p>
  
  <p>Thanks!</p>