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The DTD panel and XML Schema panels both run synchronous schema/DTD parsing from focusLost handlers. The focus is redrawn after parsing termination. This percieved perfomance problem can be solved either by: SwingWorker foxtrot Spin.off() depending on which approach will be choosen as "default".
Please forget about Spin, the bean provided by it if very dangerous inside any swing application (Swing is not reentrant except very specific places and in spin, you don't have proper control over the calls).
Spin.off! This must be really old idea, as I have not heard about Spin for last three years at least.