>
> That suggests (to me, at least) that it is related to index updating. Again,
> your GIN index seems primary candidate.
>
> Try running iostat (I think that's available on a Mac) with/without the
> fillfactor and with/without the GIN index while you do the updates. It's
> possible your SSD is just behaving oddly under stress.
>
I dropped the index and the numbers shot up tenfold or more. I don't
know why postgres feels the need to update the GIN index on the hstore
field when I am only updating an integer field but it looks like I
need to split the hstore into a different table.
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