title: Differences between sunspot and tire gems
body: <p>Currently I am using <a href="http://ts.freelancing-gods.com" rel="nofollow">thinking sphinx</a> for search. Now I'm considering using <a href="http://sunspot.github.com/" rel="nofollow">sunspot</a> or <a href="http://karmi.github.com/tire/" rel="nofollow">tire</a> because they automatically index new content. </p>
  
  <p>Are there any performance differences between the two? Is there anything else I should be concerned with?</p>