Hello Chris May,
RadCompression is
not designed to be a complete replacement for other HTTP compression tools, such as the built-in HTTP Compression in IIS 7. Instead, it is designed to work with those existing tools to cover scenarios they usually miss - namely the compression of bits moving back and forth in AJAX (and now Silverlight) applications. If you have HTTP Compression enabled in IIS7, you'll discover that it
does not compress your AJAX and Web Service responses; it only compresses the initial bits sent to the browser when the page is requested.
For more information please see this help article:
http://www.telerik.com/help/aspnet-ajax/radcompression.html
Regards,
Vasil
the Telerik team
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