Story
How to make a fast dynamic language interpreter
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Overview
Zef is a dynamic language with an extremely simple AST-walking interpreter that has been optimized for speed. The optimizations aim to make Zef competitive with established interpreters like Lua, QuickJS, and CPython.
Summary from zef-lang.dev.
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Community reactions
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Hacker News · zef-lang.dev
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Based on 5 sampled comments from this thread. Analyzed 2026-04-21.
- Praise: Wren's design choices, such as giving up dynamic object shapes, significantly enhance performance by simplifying method lookup, which is a crucial factor for dynamic language interpreters.
- Praise: The detailed breakdown of performance improvements in the article allows for a clearer understanding of how specific changes contribute to interpreter speed, which is often overlooked in other performance analyses.
- Praise: LuaJIT is recognized as a leading optimized VM for dynamic languages, demonstrating that a small and suitable language can achieve remarkable speed, highlighting the importance of language design in performance.
- Praise: The comparison of interpreter sizes reveals that Zef is impressively compact, suggesting that efficient design can lead to significant reductions in resource usage.
- Concern: The performance improvements discussed may not reflect real-world scenarios, as indicated by concerns over the specific benchmark used, which could misrepresent typical code performance.
- Concern: There is skepticism about the effectiveness of certain optimizations, particularly regarding dynamic dispatch, which can be a major bottleneck for naive interpreters, raising questions about their applicability.