My friends at Good Omens WebStudio shared with me a project that came across them for the Quercus organization. I did a quick analysis of the slow points for them. It didn't take long to do an "oh god".
The worst is not even shown on that picture:- A 1.6 megabytes ttf font used by one of the css files.
To make matters worse the way Apache is configured the font is never cached by the browser, and it can only start working when it has the font.