I have made an application with Flex with a backend BlazeDS using AMF. Also is use a XML to Object translation in my backend (Java). The first performance issue is the loading of the swf file. This is not the worst part, because you can show the visitor a preloader. I benchmarked my XML translation and this is also not an issue. But....when i do a request on the BlazeDS platform this is where my overhead strikes.
How and where can i look for the performance problems? When I make applications they also have to run on slow connections with low rates for upload. (<80kbyte/sec). Because on an intern LAN my applications is fast!