title: How much slower is using .only() vs. .values()?
body: <p>I have been using mostly <code>.values()</code> to speed up my django queries. </p>
  
  <p>Recently I tried to use the <code>.only()</code> which I assumed is only slightly slower than values with the added benefit of not having to deal with dictionaries (e.g. key typos, no code auto-complete)</p>
  
  <p>But it seems that in loading 1000 objects, <code>.only()</code> came up ~.5-1 second slower than if I were to use <code>.values()</code> (which takes about 4s).</p>
  
  <p>Have any of you experienced similar performance, and can anyone confirm or repudiate this observation?</p>