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It can take several seconds to expand the packages node for the first time, all blocking AWT. It walks aroud all subfolders and files, turns them into DataObjects first, sorts them (Um, the comparator should better cache the paths) and then displays them. Don't try it on a larger noncached source folder. Possible solution would be to cache the package index, probably with low priority background rescan for additions. Preferabely FS (not DS) based.
Petr is already working on it.
The rewrite is done. It should be a bit faster now. Petr Nejedly please cechk. That it is true. Thanks.