Web Developer Resources
http://www.devlisting.com/The Exceptional Performance team has identified a number of best practices for making web pages fast. The list includes 35 best practices divided into 7 categories.
http://developer.yahoo.com/performance/rules.htmlwebpagetest.org
http://www.webpagetest.org/Pro měření rychlosti načítání stránek
http://tools.pingdom.com/fpt/