title: jQuery selector optimisation : sizzle / pseudo / hidden
body: <p>I used Visual Studio 2010 excellent javascript profiler to profile the javascript of a web page on Internet Explorer.
  (Analyze / Launch perf wizard / Instrumentation / JS application / profile js + url of page)</p>
  
  <p>The perf report shows that jQuery's sizzle is the cause of the slowness (ie: some jquery selectors on my web page).</p>
  
  <p>It shows the time spent is in Sizzle > filter > hidden > PSEUDO.
  I do not have any selector with :hidden, so i don't understand why it looses this much time in hidden.</p>
  
  <p>I'm using jQuery 1.4.4
  I tried with jQuery 1.5 and it is the same.</p>