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In Postgres every read happens in increments of 8kb

If your rows are not ordered on disk, the amount of data you need to load to query 100 rows is insane

10kb query result (100 rows 100 bytes) requires almost 1mb of data to be loaded- it’s 99% waste

Postgres is 100x slower than other DBs for range queries

Every single other database in existence has this feature except for Postgres

1. Faster access by that column. 2. Other DBs allow it/default to it.

https://www.postgresql.org/docs/current/sql-cluster.html Also postgres can do this, it just doesn't maintain a clustered index as a going forward concern, which is an odd choice but postgres is certainly full of them.