Fitti: Waiting for Postgres 18: Accelerating Disk Reads with Asynchronous I/O
Lukas Fitti writes in detail
on the pganalyze blog about the asynchronous I/O capability coming with the
PostgreSQL 18 release.

Asynchronous I/O delivers the most noticeable gains in cloud
environments where storage is network-attached, such as Amazon EBS
volumes. In these setups, individual disk reads often take multiple
milliseconds, introducing substantial latency compared to local
SSDs.
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