Page Speed @ Google Code
Page Speed is an open-source Firefox/Firebug Add-on that you might be interested in checking out if you're concerned with how quickly your website is loading.
Webmasters and web developers can use the tool to evaluate the performance of their web pages and to get suggestions on how to improve them.
Page Speed evaluates performance from the client point of view, typically measured as the page load time (the lapsed time between the moment a user requests a new page and the moment the page is fully rendered by the browser). The best practices tested cover many of the steps involved in page load time, including resolving DNS names, setting up TCP connections, transmitting HTTP requests, downloading resources, fetching resources from cache, parsing and executing scripts, and rendering objects on the page.
Essentially, Page Speed evaluates how well your pages either eliminate these steps altogether, parallelize them, and shorten the time they take to complete. The best practices are grouped into five categories that cover different aspects of page load optimization including optimizing caching (keeping your application's data and logic off the network altogether), minimizing round-trip times (reducing the number of serial request-response cycles), minimizing request size (reducing upload size), minimizing payload size (reducing the size of responses, downloads, and cached pages), and optimizing browser rendering (improving the browser's layout of a page).
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