Same issue and took us ages to work out that is was JIT! The default is on, and setting off solves the problem. I have seen several blogs reporting the same and so wonder why this default is on?
Z
From: Олександр Янін <aleksandr.janin@privatbank.ua> Sent: Monday, April 22, 2024 8:01 PM To: Johnathan Tiamoh <johnathantiamoh@gmail.com> Cc: pgsql-generallists.postgresql.org <pgsql-general@lists.postgresql.org> Subject: Re: Performance degradation after upgrading from 9.5 to 14
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Try setting enable_memoize to off. Our practice has shown that enabling this parameter by default often resulted in less than optimal query plans in the cache.
