Making slow DOM based operations faster

gistfile1.js

//slow on a large enough collection ( > ~50 )
var self = this;
collectionData.each(function(model) {
  self.$el.append( model.get("name") );
});

//to make it fast again, you can create an element in memory and operate on that
var $inMemoryjQueryElement = $("<div/>");
collectionData.each(function(model) {
  $inMemoryjQueryElement.append( model.get("name") );
});

//and then only touch the actual DOM once
this.$el.append( $inMemoryjQueryElement );