What causes large white space in the timeline?

[mikefoskett]

Hi Pat,

I've ran a few tests recently and I'm seeing unexpected dead time, white space, in the timeline.

Any ideas what may cause this?

This result Amsterdam Chrome shows it:
http://www.webpagetest.org/result/131030...1/details/

While this one, Paris Chrome doesn't:
http://www.webpagetest.org/result/131030...1/details/

Sometimes it can be rather extreme like this London IE8:
http://www.webpagetest.org/result/131030...4/details/


Regards

Mike