OT What does google analytics do here?

Not a windows question

Retrieved this webpage eearlier tonight, and again just now,
https://ceac.state.gov/genniv/

I think it took longer this time and in the middle of retreption**, the
little notes in the bottom left of the Firefox page said something like
"transferring to google analytics".

What is the purpose of that? Being too literal is an ongoing problem
of mine, but my first thought is that google was going to analyse why
the page was taking too long to load.


**If reception is the noun for receive, shouldn't retreption be the noun
for retrieve?