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> making your code more complicated and still slower than if you thought about performance at the start.

Not if your optimization for performance is some Rube Goldberg assemblage of microservices and an laundry list of AWS services.

Exactly. Today "premature optimization" almost always means unnecessary infra or abstractions or some other complexity- not DS&A choices.

I still don't understand microservices for anything short of a NAG of four level architecture.