Loading content throuh Ajax, effect slideDown buggy

Loading content throuh Ajax, effect slideDown buggy

i'm trying to load a youtube video through an ajax call into the page.

loading the youtube video is working fine, but the slideDown effect is verry crap (shaky) for youtube video's. When i load just text or images or a google maps it's working perfectly smooth.

is there a solution for this?

my code:
  1. jQuery('#yt0').live('click',function(){
  2.     jQuery.ajax({'complete':function(){
  3.         $("#test").slideToggle(2500);
  4.     },
  5.         'url':'video.html',
  6.         'cache':false,
  7.         'success':function(html){
  8.             jQuery("#test").html(html)
  9.         }
  10.     });
  11.     return false;
  12. });