Do a checkout of NB sources from mercurial, into, say, ~/space/hg_nb
Expand ~/space/hg_nb/nb_all in the Favorites tab. My IDE has been hung for more than 5 minutes and counting...
The culprit appears to be reading the list of ignored files in order to compute the icon for various nodes; probably this should not be done synchronously.
Thread dump attached.
Created attachment 55633 [details]
Various optimizations have been added to speed up initial project parsing and opening. If you still see this type of
hanging please reopen with details on how to reproduce.