tedster - 5:19 am on May 23, 2013 (gmt 0)
Try gtmetrix DOT com and pay attention to the waterfall reporting.
We normally don't discuss specific tools here to avoid self promotion, but I'm making an exception for this discussion. Gtmetrix is already mentioned in our Favorite SEO Tools thread [webmasterworld.com]. It's been one of my go-to tools for a few years. I agree that it is excellent, especially the waterfall breakdown for every page element.