title: insert with order by is faster
body: <p>I have the following query:</p>
  
  <pre><code> INSERT INTO table(field, field1)
   SELECT value, value1  FROM table2 e 
   ORDER BY value
  </code></pre>
  
  <p>which takes less time than this one:</p>
  
  <pre><code> INSERT INTO table(field, field1)
   SELECT value, value1  FROM table2 e 
  </code></pre>
  
  <p>Does anyone know why?</p>
  
  <p>The execution plan of the second one shows that sql does an "order by" operation anyway, but is less performant than mine</p>