In RHQ, we are currently contemplating implementing a series of automated performance tests. For those tests to make any sense, we have to provide them with some initial data to work with.
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RHQ is not built to be used by thousands of users at the same time. We rather add features to the page so that it contains maximum information and context so that the users can make the right decisions about their infrastructure. But even then we do care about a responsive and reasonably performing UI (and the system as a whole of course).