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Having 5 NB.org projects open, every refresh of Navigator window shows hourglass cursor and freezes whole UI for 5-6 seconds. This is quite annoying as most people have Navigator window open all the time and refresh occurs every time one switches between editors. Attaching profiler snapshots for one switch between editors. This is a regression since 6.5, with the same userdir refresh in NB 6.5 shows hourglass for split-second but does not block UI at all.
Created attachment 82105 [details] Profiler snapshot in dev version
Duplicate of issue #164874, IMO. *** This issue has been marked as a duplicate of 164874 ***
Created attachment 82107 [details] Profiler snapshot, now really in dev version, previous one is from beta