micky,

So one statistic might have been tonight, when it took a long
time to get some parts of the page?

Not the way you think. Just the fact that you visited that webpage.

If it had gone quickly, google analytics wouldn't have noticed,
been called, kept a record?

Nope. Most likely the only reason that you saw that "transferring to
google analytics" message is because the response to your browsers request
for that data was a bit slow.

Regards,
Rudy Wieser