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jQuery / JavaScript - Loading iframe with Ajax slows down page
$("#iframe_wrapper").each(function(){
  $.ajax({
    type: "post",
    url: "http://site.com",
    data: { action: 'get_the_iframe' },
    context: this,
    success: function(html){
      $(this).html(html);
      $(this).show();
      $('#theiframe').load(function(){
        // do stuff with the iframe...
      });
    }
  });
});

<iframe id="theiframe" name="theiframe" src="http://site.com/page/"></iframe>