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From: David G. Johnston <[email protected]>
To: Clive Boughton <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: A serious change in performance between PG 15 and PG 16, 17, 18.
Date: Sun, 15 Feb 2026 21:04:35 -0700
Message-ID: <CAKFQuwYPyO+S+Hrb03pPctKP3y6LRoM1OvXBwiB3N32UUy5pzQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Sunday, February 15, 2026, Clive Boughton <[email protected]>
wrote:
>
>
> For reasons of security I can't provide all the SQL code, but I can (if it
> is necessary) provide an outline of what the code does.
>

If you cannot provide at least explain analyze, before and after, the odds
of making progress on this is greatly diminished.  A minimal reproducer you
can verify and share is exponentially better though.

It’s probably worth ensuring JIT is disabled even going off this minimal
information.

David J.


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