PhantomJS is a headless WebKit with JavaScript API. YSlow for PhantomJS is a command line script that allows page performance analysis from live URLs, unlike YSlow for Command Line (HAR) where a pre-generated HAR file is needed in order to analyze page performance. YSlow for PhantomJS also introduces new output formats for automated test frameworks: TAP (Test Anything Protocol) and JUnit, other fo
Getting started Download Page Speed. Run Page Speed against your web pages. Read about the Page Speed performance best practices. What is Page Speed? Page Speed is an open-source Firefox/Firebug Add-on. Webmasters and web developers can use Page Speed to evaluate the performance of their web pages and to get suggestions on how to improve them. How does Page Speed work? Page Speed performs several
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