The purpose of the RadScriptManager and RadStyleSheetManager is to combine the requests for resources. This should result in less script/link tags outputted on the page. When the CDN is enabled the web resources are loaded from the Amazon servers, and each loaded resource is outputted on the page as a separate element, but the main benefit from this is the caching. Whenever a user revisit the page, the resource won't be requested again from the Amazon server, but will be loaded from the browser's cache.
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