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AOL Pagetest is a completely free and open source tool for analyzing your Web pages. It is the only free too for Internet Explorer that dissects all of the requests the browser makes and displays them in a waterfall view of the page load making it easy to spot bottlenecks. Included in the waterfall display are the DNS lookup times, Socket connect times as well as each http request. It also provides the fule request and response headers for each request.
What's new in this version:
Version 126.96.36.199 supports Windows 7.