I came across this site http://jsperf.com/ember-object-creation-vs-plain-js-object.
performed on below settings:
https://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.3/jquery.min.js https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/1.0.0/handlebars.min.js https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.0.0/ember.min.js
The below is the result from firefox browers.