Aaron Hopkins, Google Software Engineer, have an interesting article on Optimizing Page Load Time. In the article Aaron shared his work on optimizing page load times for a high-profile AJAX application, and investigation on reducing latency due to external objects.

It is widely accepted that fast-loading pages improve the user experience. In recent years, many sites have started using AJAX techniques to reduce latency. Rather than round-trip through the server retrieving a completely new page with every click, often the browser can either alter the layout of the page instantly or fetch a small amount of HTML, XML, or javascript from the server and alter the existing page. In either case, this significantly decreases the amount of time between a user click and the browser finishing rendering the new content.

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Optimizing Page Load Time