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I added a slow nfs share to favorites, not every folder expansion takes several seconds and IDE just hangs during this. Also a lot of exceptions like the one attached in the log.
Created attachment 126874 [details] log example
attach a profiler snaphost with the slowness
there is a bunch of them here: http://statistics.netbeans.org/analytics/detail.do?id=194352
*** This bug has been marked as a duplicate of bug 221200 ***