How does Google Analytics send event tracking data to its server?

I opened Firefox console and ran this:

_gaq.push(['_trackEvent', 'Videos', 'Play', 'Gone With the Wind']);

      

The event is tracked and is inside google analytics, but when I run this internal console it didn't show any ajax request. How is this possible? How does Google Analytics send event tracking data to its server? Does it affect website performance if there are too many events?

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