[From TechRepublic]
On a recent project we had a very complex Web application to deliver in an environment where many of the end users had slow connections to the server on which the application was to be deployed. As such, conservation of bandwidth was one of the priorities. We decided to design for bandwidth constraints from the beginning of the project. This focus lead to a key decision to develop the application primarily using client-side scripted code–in this case written in JavaScript–which could be cached locally and by the proxy servers, etc. upstream of the end user, resulting in a significantly smaller package needing to be retrieved from the main servers.
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http://techrepublic.com.com/5100-6228-5545454.html