Delay before finishing the page

[Joppe]

Hi!

Thanks for an excellent site! It has been really useful for me!

I have 3 related questions to results I don't understand.

In the test results below there is a long delay before the page load is finished, but what is causing it? It is just empty space before favicon is finally coming from Cloudfront:
http://www.webpagetest.org/result/110914...3/details/
http://www.webpagetest.org/result/110914...2/details/
Can it be Adsense making the delay? The page is fully cached so it should not have anything to do with the server.
I get results like above quit frequently. Can I do anything about it?


This one is a bit different, the empty spaces are after favicon:
http://www.webpagetest.org/result/110914...1/details/



Here it takes forever for Cloudfront to deliver the favicon
http://www.webpagetest.org/result/110914...3/details/

Is that to be expected? I have seen it a few times since I started with CDN two days ago.
Is Amazon Cloudfront a good choice? Will they always speed up the page load or is it sometimes better with CDN and sometimes better without CDN?



Jonas