http://yahoo.github.com/boomerang/doc/
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about:
boomerang is a piece of javascript that you add to your web pages, where it measures the performance of your website from your end user's point of view. It has the ability to send this data back to your server for further analysis. It allowsto measure the round-trip time, bandwith usage and latency.
One of the first benchmarks of Hiphop PHP. Where it is said to be 200x times faster than PHP as an Apache module for massive Singleton or Static calls.
http://code.google.com/intl/fr/speed/page-speed/
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about:
Google releases Page Speed, a YSlow-like firefox extension. 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.
http://labs.opera.com/news/2009/02/05/
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about:
The announcement of Carakan, Opera's new ECMAScript Engine, using register-based bytecode instruction set. The first benchmarks show that Carakan is about two and a half times faster at the SunSpider benchmark than the ECMAScript engine in Presto 2.2 from Opera 10 Alpha.