Asynchronous Google Analytics snippets

JavaScript performance comparison

Test case created by Mathias Bynens and last updated


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.

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Testing in unknown unknown
Test Ops/sec
Default snippet
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXX-X']);
(function() {
 var ga = document.createElement('script');
 ga.type = 'text/javascript';
 ga.async = true;
 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '';
 var s = document.getElementsByTagName('script')[0];
 // s.parentNode.insertBefore(ga, s);
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 = '//';
 // s.parentNode.insertBefore(g, s);
}(document, 'script'));

Compare results of other browsers


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1 comment

Daniel15 commented :

Very strange that the default snippet performs better in Safari!

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