On your site, we've added Google Analytics to the footer, not the head tag. There is a bit of a debate about this, but Google has started saying people should put the analytics in the head tag.
If you insist on that, it would go here.
_Includes/footer.aspx is where to put it if you want better page speed.
The performance problems can be very intermittent. They result in an awkward, slow loading pages if you have too many tracking codes. Personally, I think these analytics systems are getting overused on many sites.
This is the newer “async” method for Analytics. In it, they admit that moving the script higher in the page causes the page to be slower. Async takes care of that problem.
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