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Contributing cause to deadlock in issue #98573: changing anything which affects project.xml in an NBM project causes an evaluator prop change on null, which triggers a lot of extra work. In particular, PROP_CONTAINERSHIP is refired from SourceGroup's, which leads to expensive recomputation.
No known serious performance impact.
Not into 7.0 or next release. Feel free to reopen if more important than it seems.
NetBeans.org Migration: changing resolution from LATER to WONTFIX