This is an old issue. Orphan thoughts and Parentless thoughts reports requires PB to run through every thought in the database. Sadly there is no index available for the program to look into. In my brain these reports take around 30 - 45 minutes to complete. I have approximately 30K thoughts. I have previously suggested that it should be possible to cancel the report instead of having to force PB down if you don't have the time to see it complete.
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