David Osborne <da...@qcode.co.uk> writes:
> Hi, I was wondering if someone could help us work out why this query is so
> slow.
> We've just dumped a database (Postgresql 9.1) and restored it to a new
> instance (AWS RDS 9.6) (via pg_dump, restored to psql)

The first question people will ask is did you re-ANALYZE the new
database?  pg_dump doesn't take care of that for you, and auto-analyze
might not think it needs to process the smaller tables.

                        regards, tom lane

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