Rust compiler performance work, September 2026
What happened
Rust compiler performance work made progress in September 2026. According to an October 1 report, average wall-clock compile time fell 4.57% between 2026-07-29 and 2026-09-28, with 555 of 629 benchmarks improving and 74 regressing. Upgrading to LLVM 23 gave an average 1.2% speedup, and enabling PGO for Clippy improved it by up to 18%. The new borrow checker Polonius Alpha and the new trait solver are now enabled on Nightly.
Written by AI from the coverage · updated 3 hours ago
Coverage
Follow the reports to see the story from different sides.
- Hacker News front pageHow to speed up the Rust compiler in September 2026
Rust 编译器在 2026-07-29 至 2026-09-28 期间平均墙钟时间下降 4.57%，629 项基准中 555 项改善、仅 74 项回退。LLVM 升级至 LLVM 23 带来平均 1.2% 提速，Clippy 启用 PGO 后最佳提升 18%；新借用检查器 Polonius Alpha 与新 trait solver 已在 Nightly 启用。
Heat over time
Heat now 9·Comparable peak 10（Oct 1 22:00）·Comparable change over 24 hours –
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