title: Mongodb toArray() performance
body: <p>I have a collection 'matches' with 727000 documents inside. It has 6 fields inside, no arrays just simple integers and object Ids. I am doing query to collection as follows:</p>
  
  <pre><code>matches.find({
    $or: [{
        homeTeamId: getObjectId(teamId)
      }, {
        awayTeamId: getObjectId(teamId)
      }
    ],
    season: season,
    seasonDate: {
      '$gt': dayMin,
      '$lt': dayMax
    }
  }).sort({
    seasonDate: 1
  }).toArray(function (e, res) {
    callback(res);
  });
  </code></pre>
  
  <p>Results returning only around 7-8 documents. 
  The query takes about ~100ms, which i think is quite reasonable, but the main problem is, when i call method toArray(), it adds about ~600ms!!
  I am running server on my laptop, Intel Core I5, 6GB RAM but i can't believe it adds 600ms for 7-8 documents.
  Tried using mongodb-native driver, now switched to mongoskin, and stil getting the same slow results.
  Any suggestions ?</p>