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Okay. Doesn't help me much, but I was hoping the questions I asked might give you some ideas where optimizations could occur. I suggest you use a profiler to find out what's taking so long.

That's not what your original problem description said, though there is no distinction between access for "read only" versus "read/write." Besides, what's the use of reading data that is changing?
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"changing content at the same time" may be your problem. Access to the resource should be limited to one client at a time. Read up on java multithreading (or concurrency) and synchronized...