How to speed up the Rust compiler in September 2026
Summary
This article documents measurable Rust compiler performance improvements in September 2026, highlighting a mean 4.57% wall-time reduction across 629 benchmarks and notable gains from rustdoc, Clippy with PGO, and an LLVM upgrade. It covers ongoing work on Polonius (the new borrow checker), the new trait solver, dataflow analysis optimizations, and various micro-optimizations across crates, with emphasis on real-world impact and benchmarking insights.