--- title: This Week in Rust 675 · This Week in Rust | daily.dev description: This issue of the Rust community newsletter covers 609 pull requests merged in the past week. Highlights include a large reduction in query cache size from PR... canonical: https://daily.dev/posts/this-week-in-rust-675-this-week-in-rust-48mrowggp twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: This Week in Rust 675 · This Week in Rust | daily.dev og:description: This issue of the Rust community newsletter covers 609 pull requests merged in the past week. Highlights include a large reduction in query cache size from PR... og:url: https://daily.dev/posts/this-week-in-rust-675-this-week-in-rust-48mrowggp og:image: https://api.daily.dev/og/posts/48mRowGgp.png og:image:alt: This Week in Rust 675 · This Week in Rust og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # This Week in Rust 675 · This Week in Rust **[This Week in Rust](https://daily.dev/sources/twirust)** · 9 min read · 1 upvotes · 0 comments ## Summary This issue of the Rust community newsletter covers 609 pull requests merged in the past week. Highlights include a large reduction in query cache size from PR #164300, plus stabilizations like ExitCodeExt for Windows and String::into_chars. The compiler performance triage reports 195 primary improvements averaging -0.8% versus 25 regressions averaging 0.8%, with a doc build regression still under investigation. Crate of the Week is offline-protocol, a mesh-networking and peer discovery library. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How much did the query cache size improve in the recent rustc change from PR 164300? PR #164300 deduplicated DefId encodings in the query cache, producing a large reduction in query cache size. It was called out as a notable improvement in a week where 609 pull requests were merged across the Rust project, alongside broader compiler performance gains. _Developers tracking rustc performance work can follow changes like this on daily.dev._ ### What was the overall instruction count change in the latest Rust compiler performance triage? The overall change across primary benchmarks was -0.6%, ranging from -12.6% to 6.8%. There were 195 primary improvements averaging -0.8% and 25 primary regressions averaging 0.8%, with 3 regressions, 6 improvements and 3 mixed results across 32 artifact comparisons. A doc build regression was under investigation. _Anyone weighing rustc upgrade timing can check performance triage results like these on daily.dev._ --- Tags: [#rust](https://daily.dev/tags/rust) [View this post on daily.dev](https://daily.dev/posts/this-week-in-rust-675-this-week-in-rust-48mrowggp) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"This Week in Rust 675 · This Week in Rust","url":"https://daily.dev/posts/this-week-in-rust-675-this-week-in-rust-48mrowggp","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/this-week-in-rust-675-this-week-in-rust-48mrowggp"},"datePublished":"2026-10-29T01:52:10.314Z","dateModified":"2026-10-29T01:52:34.440Z","description":"This issue of the Rust community newsletter covers 609 pull requests merged in the past week. 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