Asynchronous Google Analytics snippets

JavaScript performance comparison

Test case created by Mathias Bynens and last updated

Info

Test case which measures the speed difference between the default asynchronous Google Analytics snippet and the optimized version.

Note that I commented out the s.parentNode.insertBefore(g, s); line in both scripts, since otherwise the <script> element gets inserted a few thousand times every time you run the tests. Since this code is the same in both scripts, it shouldn’t have an influence on the results.

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
Default snippet
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXX-X']);
_gaq.push(['_trackPageview']);
(function() {
 var ga = document.createElement('script');
 ga.type = 'text/javascript';
 ga.async = true;
 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
 var s = document.getElementsByTagName('script')[0];
 // s.parentNode.insertBefore(ga, s);
})();
pending…
Optimized snippet
var _gaq = [['_setAccount', 'UA-XXXXX-X'], ['_trackPageview']];
(function(d, t) {
 var g = d.createElement(t),
     s = d.getElementsByTagName(t)[0];
 g.async = 1;
 g.src = '//www.google-analytics.com/ga.js';
 // s.parentNode.insertBefore(g, s);
}(document, 'script'));
pending…

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

1 comment

Daniel15 commented :

Very strange that the default snippet performs better in Safari!

Add a comment