Thread

Writing Rust code that's fast by asking agents to make the code faster

114 points · 63 comments · mooreds

Keats · 1790097777 · focus · HN ↗
As the author of Tera mentioned in the article, I am curious how it can get 2x faster. Was the benchmark using tera v2 with the `fast` feature enabled?
1. minimaxir · 1790100353 · focus · HN ↗
  They were with tera 2.1.0, however using the default settings and not enabling the `fast` feature (which I did not know about, TIL).
  The comparison benchmark results in the post were older and prior to further passes. After updating to tera 2.4.0 and enabling the `fast` feature set, I reran the benchmarks against the current codebase and the difference between my Rust crate and Tera is now about ~1.5x.
  Some of the technical differences are (which in disclosure were surfaced by GPT 5.6 Sol): context and loop values are borrowed while Tera clones, cached static positions/lookups, less per-render heap setup, escaping chunks directly into the final String instead of bytes, and more granular bytecode functions which avoid stacks.
  1. oever · 1790102844 · focus · HN ↗
    Full type checking like in Askama and hot reloading of templates would be a great combination. Is that a feasible path with your project?

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