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From: Tom Lane <[email protected]>
To: Clive Boughton <[email protected]>
Cc: [email protected]
Subject: Re: A serious change in performance between PG 15 and PG 16, 17, 18.
Date: Sun, 15 Feb 2026 23:03:42 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Clive Boughton <[email protected]> writes:
> When I recently upgraded to PG 18.1 (without any changes to the DB functions or tables, or indexing) it took 7-10 hours to produce the same result - a 300-600 times decrease in performance.

This complaint is completely un-actionable for lack of relevant
details.  There are some hints here about describing performance
problems usefully:

https://wiki.postgresql.org/wiki/Slow_Query_Questions

			regards, tom lane

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