Simon Willison 3/13/2026

Shopify/liquid: Performance: 53% faster parse+render, 61% fewer allocations

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A detailed look at a performance optimization PR for Shopify's Liquid template engine, where CEO Tobias Lütke used an AI coding agent (autoresearch) to run hundreds of experiments. The improvements include micro-optimizations like replacing StringScanner with byteindex and caching integer strings, resulting in 53% faster benchmarks and 61% fewer allocations. The article discusses the role of robust test suites and AI agents in enabling deep technical contributions.

Shopify/liquid: Performance: 53% faster parse+render, 61% fewer allocations

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