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> Most queries to a DB like mongo are slow enough

Strange. MongoDB has been consistently the fastest database I've ever used. Especially if your data model is document orientated.

Really? Stock Postgres is faster than a well-optimised Mongo deployment, in my experience.

(Apples to oranges, sure, but Postgres has the capability to be a great document store as well.)

> Especially if your data model is document orientated.

You shouldn't be using MongoDB for anything but documents.