we all know that Google's affects your page rank with the load time of a page. How? That's part of the secret sauce. But we know that page speed is a serious factor.
So -> what is considered the speed of a page?
Is it just the first (and main) html file which the GET receives? Or does it also include loading of images as part of that speed.
so for example...
GET /index.htm <- takes 0.45 seconds to retrieve (including DNS lookup before).
robot parses page.. see's there's a single main image....
GET /img/main.png <- takes 5 seconds to download.
is the page speed for that resource, 0.45 seconds OR 5.45 seconds?