Just happened to stumble upon https://bugzilla.gnome.org/show_bug.cgi?id=591546. So, it seems this is already reported upstream.
** Bug watch added: GNOME Bug Tracker #591546 https://bugzilla.gnome.org/show_bug.cgi?id=591546 -- file operations dialog takes forever to finish https://bugs.launchpad.net/bugs/486352 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs