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I have a project with about 2000 classes in it. The first time I expand the sources node in the project tree, the parser loops through all 2000 classes looking for the package structure. This process is always slow and the results don't seem to be cached between invocations of NetBeans. It would seem that the modification times could be checked on the files or directories to see if anything has changed between invocations and if nothing has changed, just display the exact same package structure as shown before.
*** This issue has been marked as a duplicate of 117179 ***