Pagespeed
A set of tools from Google for applying performance best practices to web pages.
Yslow
A tool written by Yahoo! that analyzes web pages and suggests ways to improve their performance
Better detailed small
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"My testing so far google s pagespeed addon gives much more detailed analysis and smarter advice rather than recommending a cdn for small websites like yslow" from question Fast Loading web pages |
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"In my testing so far google s pagespeed addon is far and above much better than yslow" from question Fast Loading web pages |
Others
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I use firefox with firebug and yslow and think it s more reliable than pagespeed from question Facebook is not compressing Java Script files used in Like and Comment Plugin |
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This configuration satisfies both pagespeed leverage browser caching and yslow add expires headers;yslow requires a value greater than 7 days from question Http expire headers in asp.net with web.config |
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Imho pagespeed is better than yslow from question Tool for measuring html5 performance(YSlow or PageSpeed) |