November 3rd, 2011

Using Google Analytics to Measure Website Performance by Selwin Ong

We previously talked about the importance of building fast websites and easy ways to achieve that by enabling gzip compression and using CSS sprites.

That’s all well and good, but how do you know if the changes you made actually translate to faster website load times for your visitors? An easy way to measure this is to use Google Analytics, an extremely popular analytics tool. Having performance data for your website is very nice in that it allows you to measure:

  • Content – which landing pages are slowest?
  • Visitor – how does latency compare by visitor type or geographic region?
  • Technology – does browser, operating system or screen resolution impact latency metrics?
  • Performance – what is the most common load time, or the longest?

This metric is not tracked by default, so you’ll have to slightly modify your tracking code by adding a “_trackPageLoadTime” parameter. For example:

<script type="text/javascript">// <![CDATA[
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-XXX-1']);

  (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);
// ]]></script>

Once implemented, you’ll be able to observe your website’s performance from the “Site speed” section in Google Analytics.

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