# Scale Is a Sequence, Not a Destination

> Systems do not break at scale. They break in a predictable order, and knowing the order is most of the job.

- Type: essay
- Published: 2026-05-07
- Topics: scale-and-performance, solution-architecture, capacity, postgres, queues
- Canonical: https://cmlonder.com/essays/scale-is-a-sequence

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Nobody hits "scale". You hit a specific bottleneck, fix it, and reveal the next
one. The useful skill is not making things fast — it is knowing which wall you
are about to hit.

## The usual order

Read load saturates first, and it is the cheapest to fix. Then write contention.
Then the thing nobody modelled: a single coordination point that every request
touches.