I have to support IE6 and I calculate rendering time by creating a timestamp in javascript at the beginning of the page and doing the difference when document.ready is fired in jQuery.
If I do 3 pages load, the rendering times in milliseconds can look like this :
page 1 : 735, 2672, 734
page 2 : 3063, 1516, 3375
page 3 : 8281, 2531, 3703
Why is that? How can I have more consistency?