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Double buffering in JPanel

Doug Gschwind
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Has anyone found the threshold that when exceeded forces you to require the use of double buffering in a JPanel? Since double buffering increases memory usage, I would like to only use it when certain hardware resources are lacking and thus induce "flickering" within single buffered JPanel instances.
Also, if a JPanel instance is a nested component within a higher level JPanel instance, should the double buffering policy be set consistently at all levels? e.g.
JPanel parent = new JPanel(true);
JPanel child = new JPanel(true);
Do we care about the double buffering policy of internal JPanels if the top level JPanel's double buffering policy governs all internal panels as well?
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