This could be done with a synchronous ajax request attached to the (nonstandard) onbeforeunload event. Something else I'd like to see is a measurement of avera

This could be done with a synchronous ajax request attached to the (nonstandard) onbeforeunload event. Something else I'd like to see is a measurement of average page load times. In practice the best you could do is time from tracking script load to dom ready and/or body load. So your numbers would be off, but still useful for spotting trends.