I've developed Flash based clients and some basic MU apps. My advice is not to encode the delta information for your MU apps in XML , devise an encoding that won't tax Flash's XML parser and encapsulate this within a CDATA element. The XML parser can't handle large a/o deeply nested XML fragments efficiently. Check out http://chattyfig.figleaf.com/ for optimized XML and event handling libraries. You might also check the 'flashcoders' archive at this site for advice on handling XML efficiently.
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