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The code which performs the instance removal is done in the AWT thread. This operation can take a few seconds and during this time IDE repainting is blocked. This should be done in a separated thread.
Even it is a performance bug usage of this action is obviously very rare so it has not so high priority.
should be fixed for 3.6
Marku, are you really sure this needs the fix-in-36? The action is _realy_ rare. I would prefer spending time fixing other issues.
not critical for 4.0
Very old issue based on 3.6. Please reopen if the bug is applicable to NetBeans 6.5