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Where does the time go? It's definitely not the network latency, nor CPU overload.
How do you know it is not network latency? There a profiling tools to tell you what it's doing.
How do you know it is not network latency?
A ping to the AS takes less than 0.1 ms. And other services on the AS (JBoss and non-JBoss) respond much faster. And it's independent on whether the client is local or remote.
There a profiling tools to tell you what it's doing.
Which profiling tools are there? Could you recommend one?
There's JProfile[r?] and JBoss Profiler. The former has a trial version you can use, and the latter is free but is potentially non-trivial to set up.