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YSlow - Official Open Source Project Website

YSlow Grade details screenshot

YSlow analyzes web pages and why they're slow based on Yahoo!'s rules for high performance web sites

ยป View YSlow Ruleset Limitations across several browsers/platforms.

Yahoo!'s Exceptional Performance team has identified 34 rules that affect web page performance. YSlow's web page analysis is based on the 23 of these 34 rules that are testable. Click each performance rule below to see the details.

url: http://yslow.org/

type: project, format: page


WebPagetest - Website Performance and Optimization Test

WebPagetest is an open source project that is primarily being developed and supported by Google as part of our efforts to make the web faster.

WebPagetest is a tool that was originally developed by AOL for use internally and was open-sourced in 2008 under a BSD license. The platform is under active development on GitHub and is also packaged up periodically and available for download if you would like to run your own instance.

url: http://www.webpagetest.org/

type: project, format: page