Dev claims 10x faster Rust builds via per-function codegen caching and fine-grained invalidation
charliermarsh · x · 2026-10-21
Developer jkelleyrtp claims a 10x speedup for Rust builds, sharing early numbers: dissolving crates as the compile unit, aggressively caching codegen per function, and fine-grained span invalidation. Charlie Marsh adds detail on rustd, built on Rust Analyzer—incrementally analyzing Rust via HIR (and MIR for some features), then lowering MIR to Cranlift IR and machine code.
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