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An overall grade and score for the web page is computed by summing up the values of the score for each rule weighted by the rule’s importance. When analyzing a web page, YSlow deducts points for each infraction of a rule and then applies a grade to each rule.

Add an Expires or a Cache-Control Header.

Studies have shown that web page response time can be improved by 25% to 50% by following these rules. These testable rules are listed below roughly in order of importance and effectiveness. YSlow’s web page analysis is based on the 23 of these 34 rules that are testable. Yahoo!’s Exceptional Performance team has identified 34 rules that affect web page performance. YSlow is not integrated into Firebug Lite. YSlow for Firefox is integrated into the Firebug web development tool for Firefox. It measures the page’s performance and offers suggestions for improvement. YSlow analyzes web page performance by examining all the components on the page, including components dynamically created by using JavaScript.