Looking back, by far the largest change in the period Sep 1 - Sep 11 was the
lazy xid calculation and read-only transactions. That seems like the most
likely culprit.

But given Tom's comments this commit stands out too:

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Log Message:
Release the exclusive lock on the table early after truncating it in lazy
vacuum, instead of waiting till commit.

Modified Files:
        vacuumlazy.c (r1.92 -> r1.93)

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  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com
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