FWIW, during an "import group data from newsbin 5.xx" task, the log stated:
[12:30:05] HIGH - High Speed File Creation Mode: Enabled
[12:36:33] ERROR - Unable to Create NZB:Some shit...
[12:37:37] ERROR - Unable to Create NZB:Some different shit...
[12:37:45] ERROR - Unable to Create NZB:Some shit I don't want to know about
I feel I have lots of computing resources available.