Blog Posts by Betty Tso

  • YSlow for Mobile Now Available

    YSlow for Mobile screenshotyslow-mobileAt the Velocity Conference today, Yahoo! announced the launch of YSlow for Mobile, which brings YSlow’s web performance analysis to the mobile platform for the first time.

    YSlow for Mobile analyzes your mobile web site performance, and suggests ways to make mobile web pages load faster – right in your mobile device. It is a bookmarklet – an unobtrusive JavaScript program stored in a browser’s bookmarks menu. This version works in browsers that support bookmarklet and JavaScript.

    YSlow for Mobile preserves core YSlow functionality and UI. It also introduces a new feature, YSlow Social - the ability to share YSlow results with your Facebook and Twitter networks.

    YSlow for Mobile provides page performance suggestions based on a set of rules for high performance web pages. This is a flexible set of performance best practices for Desktop browsers. Most of them continue to be valuable and applicable for Mobile performance. We will continue to update this ruleset with community research

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  • YSlow 2.1.0 release

    YSlow 2.1.0 is now available (courtesy of Marcel Duran). There are major bug fixes in this release, as well as making YSlow compatible with Firefox 4.

    YSlow is a Firefox add-on integrated with the Firebug web development tool. It analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.

    YSlow analyzes web pages and suggests ways to improve their performanceyslow-1010

    Summary of bugs fixed

    • Compatible with latest Firefox 3.6., as well as Firefox 4 Beta.
    • Compatible with Firebug 1.6 beta
    • Updated JSLint version (2010-09-16)
    • Improved error message display (removed pop-up, using console instead for error message)
    • Fixed some infinite loops issues for redirects and some autorun weird behavior.
    • Added new rule for detecting empty src or href (, , and
    • Added logic to not consider deferred scripts on head as offenders — previous version of YSlow complains when scripts tags are inserted dynamically into the HEAD tag. Such
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