Hi guys,

>>FWIW you still haven't explained how the upgrade was performed. That might be 
>>a very important piece of information, because the 9.4 cluster might have 
>>hint bits set and/or the data may be mostly frozen, but the
>>9.6 cluster may not have that yet, resulting in higher CPU usage.

We upgraded the database with a pg_dumpall from 8.4.22 and then a psql < 
BACKUP.SAV command!

Thank you again!
Francesco

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