Simon Willison 1/15/2026

The Design & Implementation of Sprites

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This article details the technical implementation of Fly.io's Sprites, describing them as "disposable computers" provisioned from warm pools of machines using a standard container. It explains the performance benefits and delves into the custom persistence layer, which uses a JuiceFS-like model with object storage for data chunks and SQLite/Litestream for fast, durable metadata management.

The Design & Implementation of Sprites

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