I have no affiliation but do use GTmetrix quite a bit when optimizing client websites: http://gtmetrix.com/ http://gtmetrix.com/ It works like an aggregator of

I have no affiliation but do use GTmetrix quite a bit when optimizing client websites: http://gtmetrix.com/ http://gtmetrix.com/ It works like an aggregator of all the existing speed tools and provides a nice speed testing resource that is outside my local network.