YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. Feature highlights:
» View YSlow Ruleset Limitations across several browsers/platforms.
Yahoo!'s Exceptional Performance team has identified 34 rules that affect web page performance. YSlow's web page analysis is based on the 23 of these 34 rules that are testable. Click each performance rule below to see the details.
» Check out the YSlow Ruleset Matrix to see how the grade is computed.
YSlow development is discussed in the Exceptional Performance group.