Lots of improvements. It uses a lot less CPU time. It think that could be related to a multitabbed bug I read about somewhere. It also seems to scroll faster and possibly render faster. Its hard to tell, though. It was already really fast.
But there is one annoying thing...they switched the keyboard shortcut for back and forward from Command-Left to Command-[. While I admit it is in a better position ergonomically, I am used to Command-Left. I find it frustrating.
Taft