Rust Build Times

Purpose

Guide agents through diagnosing and improving Rust compilation speed: cargo-timings for build profiling, sccache for caching, the Cranelift codegen backend for faster dev builds, workspace crate splitting, LTO configuration trade-offs, and fast linkers (mold/lld).

Triggers

• "My Rust project takes too long to compile"
• "How do I profile which crates are slow to build?"
• "How do I set up sccache for Rust?"
• "What is the Cranelift backend and how does it help?"
• "Should I use thin LTO or fat LTO?"
• "How do I use the mold linker with Rust?"

Workflow

1. Diagnose with cargo-timings