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The rules are listed in order of importance from most important to least important. The page is graded based on 23 testable rules for high performance web pages (see Performance Rules). The overall letter grade for the page is displayed at the top along with an overall numeric performance score. The Grade View displays a report card for the web page. To view an analysis of the page's performance, choose the Grade tab or click the page's letter grade in the status bar at the bottom of the page. You can navigate between these views by selecting the tab with the view name under the YSlow tab of the Firebug console.įollowing are descriptions of the Grade, Components, and Statistics views. YSlow displays the results of its analysis in separate Grade, Components, and Statistics views. If you left click on the page weight value in the status bar, the Statistics View will be displayed in the Firebug window.
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If you left click on the grade in the status bar, the Grade View will be displayed in the Firebug window. If you left click on the YSlow icon on the left side of the status bar or the response time value on the right side, the page display will toggle between displaying the entire page and displaying the page with the Firebug window. You can enable or disable the Autorun option by right clicking anywhere in the YSlow status bar and selecting or deselecting Autorun. You can click on the box next to Autorun YSlow each time a web page is loaded to set up YSlow to run each time the browser loads a web page. You may also click on the Grade, Components, or Statistics tabs to start the web page analysis. The first time you bring up Firefox with YSlow, the following screen will be displayed in the Firebug portion of the browser window:Ĭlick Run Test to run YSlow. Click the YSlow button on the status bar.Open the Firebug window and click on the YSlow tab.There are two ways to start YSlow for Firefox: YSlow for Firefox runs in the Firebug window, so in order to run the tool, Firebug must be enabled. Refer to NodeJS Server page for more information. Refer to PhantomJS page for more information. Refer to Command Line HAR page for more information.
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Refer to Safari page for more information. Refer to Mobile/Bookmarklet page for more information. Once Firebug is installed, download YSlow for Firefox from. Obtain the latest version of Firebug from. Refer to Customizing Rulesets for more information.
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Classic(V1) - this ruleset contains the first 13 rules listed above.YSlow(V2) - this ruleset contains the 23 rules listed above.For various reasons, there may be some rules that are less important for your particular page.įrom YSlow 2.0 on, users can create their own custom rulesets in addition to the following three predefined rulesets: Note that the rules are weighted for an average page. 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.
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