title: jquery animation delay when scrolled
body: <p>im currently struggling with a jquery animation. its just a little animation to change height and opacity on scroll.
  the problem is, that the animation doesnt run fluently while i scroll. when i scroll really slow the animation does not finish in time. its like it pauses till i stop scrolling.</p>
  
  <p>jquery:</p>
  
  <pre><code>$(window).scroll(function(){
  if  ($(window).scrollTop() &gt; 0){
       //$('#navigation').addClass('scroll');
       $('#navigation').stop().animate({height: '92px'});
       $('#navigation .bg').stop().animate({opacity : '.85'});
  } else {
      //$('#navigation').removeClass('scroll');
      $('#navigation').stop().animate({height: '142px'});
      $('#navigation .bg').stop().animate({opacity : '0'});
      }
  });
  </code></pre>
  
  <p>css:</p>
  
  <pre><code>#navigation {
  width: 1350px;
  position: fixed;
  z-index: 2000;  
  
  background: -moz-linear-gradient(top,  rgba(0,0,0,0.75) 0%, rgba(0,0,0,0) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.75)), color-stop(100%,rgba(0,0,0,0))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  rgba(0,0,0,0.75) 0%,rgba(0,0,0,0) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  rgba(0,0,0,0.75) 0%,rgba(0,0,0,0) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  rgba(0,0,0,0.75) 0%,rgba(0,0,0,0) 100%); /* IE10+ */
  background: linear-gradient(to bottom,  rgba(0,0,0,0.75) 0%,rgba(0,0,0,0) 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#bf000000', endColorstr='#00000000',GradientType=0 ); /* IE6-9 */
  height: 142px;
  </code></pre>
  
  <p>}</p>
  
  <pre><code>#navigation .bg{
  background: #000;
  position: absolute;
  width: 100%;
  height: 92px;
  top:0px;
  left: 0px;
  opacity: 0;
  </code></pre>
  
  <p>}</p>
  
  <p>thanks in advance</p>