OK, upon repeating this, I did notice a difference. In Firefox, I first see just a blue background with the text links that are supposed to be on the left side of the page displayed in the center of the page. This quickly resolves and the page displays the full content in its final form. The total time for the page to fully render in IE and Firefox seems to be about the same. So, when you said "delay", I guess I was expecting something more.
I don't know yet what causes this difference. If I have a chance to look at it in more detail and notice something that might be the cause, I'll post here again. In the meantime, someone else may have a suggestion.