https://bugs.openldap.org/show_bug.cgi?id=10406
--- Comment #7 from Ben Alex ben.alex@acegi.com.au --- Thanks Howard for looking into this further.
It appears we've isolated it to a specific write path (mdb_cursor_put) and there is no regression on the alternate write path (mdb_put). As such I am happy if you wish to close this ticket. I'll just adjust our benchmark to use mdb_put.