site optimisation?

[md_doc]

Hi all,

I've been looking at ways to improve the performance of the website that I manage, & have been helped enormously by the information at the Yahoo! Developer Network performance page.

I use Firebug & YSlow extensively, but what I really need is a tool that automates page load time testing & aggregates the data so that I can get an overview of how changes to our code are affecting load times.

Does anyone know of any software (open source or not) that performs this kind of testing?

Thanks for any advice.