Any Yslow type PHP script?

[diagnostix]

Hi

Has anyone come across any scripts that does something like yslow? Basically I'm trying to write a script that will check the total loading time of a webpage with all its images/js scripts/css files etc?

Does any one have any suggestions?

Thanks

D.

[Weedpacket]

Firebug already does that (I mean, the YSlow I'm thinking of is a Firebug extension, right?)