RadCompression is a HttpModule that ships with the RadControls for ASP.NET AJAX that is designed to
automatically
compress your AJAX and Web Service
responses. In other words, RadCompression will intercept the bits that
your server is sending back to a browser (or Silverlight-client, for
that matter) and compress them. Once
the compressed bits reach the browser, standard browser technology
takes-over and decompresses the response, so your application can work
with it normally.
The compression process
is completely transparent to your client-side code (JavaScript or
Silverlight) and your server-side code. It simply reduces the number of
bits that must be sent over the wire
(from your server to your client) and thus- in theory- improves your
page performance by reducing the TTLB (time to last byte).
To get familiar with the control please follow these online resources: