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I opened Firefox console and run this:

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

Event is tracked and is inside google analytics, but when I run this inside console it didn't showed any ajax request. How is this possible? How does google analytics send event tracking data to their server? Does it impact site performance if there is too many events?

JohnyFree
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  • Have a look at https://developers.google.com/analytics/devguides/collection/gajs/eventTrackerGuide – AAA Sep 27 '14 at 13:30
  • I checked this before but didn't find answer to my question. – JohnyFree Sep 27 '14 at 13:49
  • Just found answer. It uses gif image to send data. [link](http://stackoverflow.com/questions/7343153/why-does-google-analytics-use-a-one-pixel-picture-to-transfer-data) – JohnyFree Sep 27 '14 at 13:55
  • This is a good explanation: http://mrcoles.com/blog/google-analytics-asynchronous-tracking-how-it-work/ – Tyler Jun 22 '16 at 16:47

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