> Or were you testing 0002 from
> https://postgr.es/m/CA%2BhUKGLMFtNqei9nfcJy2SQMLWyYuO9E8NLYrb%3D4Gs1HgkAS7Q%40mail.gmail.com
> which is a completely different patch?
Yes, I tested the aforementioned patch under the name: 0002-Use-ReadRecentBuffer-for-btree-root-page.patch in this thread.
> We don't backpatch performance improvements unless they are addressing
> performance issues that are so severe that they basically amount to a bug.
Thank you for your answer. Will keep it in mind for the future.
Kind regards,
Ian Ilyasov.