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Your ignorance of the difference between server and client side Java leads me to believe that you're probably wrong.

This usually seems to be due to bad code, or bad GUI libraries (which Java seems to be the king of)

And bad developers using those libraries.

The fact that this sluggishness is not present in Visual Basic programs implies this is the library, not the programmers or the language.

IntelliJ, which is a large Java Swing application, certainly works fine and quick on all of my machines.