May 26, 2018

Analyzes web pages and why they are slow

YSlow analyzes web pages and tells you why they’re slow based on Yahoo’s rules for high performance web sites.

YSlow gives you

  • Performance report card
  • HTTP/HTML summary
  • List of components in the page
  • Tools including JSLint

Most files comprising YSlow are licensed under the Mozilla Public License MPL version 1.1, with a couple of exceptions. YSlow includes jslint by Douglas Crockford, which is licensed under a BSD-style license. YSlow also includes files from the Yahoo! User Interface library, which are licensed under the BSD license.

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