so as I am aware that I will be able to take advantage of all of the new features of Sierra (like auto-unlock) what type of performance decrease should I expect? 8 considered not updating because of planned obsolescence and such. It's a 2.8 ghz i7 with 8 gb ram. 8 treat it very well and day to day performance is flawless! I would like to keep it that way too! Any of the beta testers have any feedback for me? Any input is appreciated!