One thing that I realized by accident today:
The duplicate detection is having a deep performance impact on paging.
With the LastPage stuff we would only add one record per-page, and delete it as soon as we
had the confirmation of commit, having a minimal impact on the journal.
The duplicateID however, is storing one extra record perMessage. I know we will have the
circularID and stuff, but that is just not as optimal wise as what we had before.
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