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by stonemetal12 827 days ago
Even though PG caches it is still doing all the things to run the query. It is like saying why does a 3d render take so long to render an image when the same image saved to a PNG opens so much faster.

The article talks about using Unlogged tables, they double write speed by forgoing the durability and safety of the WAL. It doesn't mention query speed because it is completely unaffected by the change.