NEW 130753
iframe performance 
https://bugs.webkit.org/show_bug.cgi?id=130753
Summary iframe performance
bjb5682
Reported 2014-03-25 16:16:18 PDT
Iframe performance simply sucks. See http://jsfiddle.net/mz4ac/ in Chrome, it loads all the frames in under 5 seconds. In Safari, it freezes for a while, guzzles up 4GB of ram, and slows down rendering even after the page is closed.
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