Sitespeed.io is an open source tool that helps you analyze and optimize your website speed and performance based on performance best practices. It will collect data from multiple pages on your website (crawling from a startpoint), analyze the pages using performance best practices rules, and output the result as a couple of HTML-files.
Run ./sitespeed.io -u http://en.wikipedia.org/ -d 1 and out comes a nice report:
Do You Sitespeed? →
sitespeed.io example report →
sitespeed.io →