Simon Willison 3/13/2026

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

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A detailed analysis of a Shopify/Liquid pull request where CEO Tobias Lütke used an AI-powered 'autoresearch' system to run hundreds of experiments. The result was dozens of micro-optimizations, like replacing StringScanner with byteindex and caching integer strings, leading to a 53% performance boost and 61% fewer allocations in the Ruby template engine.

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

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