From IEBlog:

We’re focused on making Internet Explorer 9 amazingly fast, and we want to help make their sites fast as well. Enabling to accurately measure the of their websites is critical to making the faster and enabling a new class of HTML5 applications. At Velocity, we announced Internet Explorer 9 as the first browser to provide performance information to developers at runtime, which we introduced in the latest IE9 platform preview . With special thanks to Steve Souders and Zhiheng Wang from , the WebKit team and Mozilla

f978227209Perf 1.png 350x153 Measuring Web Page Performance

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Measuring Web Page Performance