As announced in my previous post google were working on a new event-driven funcion to track user timings and now the lack of documentation is only a memory.
Here you can find the documentation for the _trackTiming funcion and here some examples on how to use it.
As the example you can use:
_gaq.push([‘_trackTiming’, ‘category’, ‘variable’, time, ‘opt_label’, opt_sample]);
As you can see from the image there are various parameters to setup and the use of this function is not so trivial.
To make this easier google wrote a live demo of some script time tracking here. Potentially you can track everything with some coding.
Thanks to GoAnalytics.info.