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Comment by hubert123 | Hacker News Reader

still compiles too slowly, a language in 2016 just cannot take multiple seconds for me to use it add 5 crates and watch ur compile/run cycle climb to a cool 10+ second average.

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We had significant compile-time improvements in the release yesterday, with more to come in the future. Also, you might want to give incremental recompilation a try, it's nightly-only for now, but being actively worked on.

> add 5 crates and watch ur compile/run cycle climb to a cool 10+ second average.

It should not recompile those crates each time, if it does, that's a bug. Please report them!

Just to litmus test this, I rebuilt a small Rust project of mine that depends on 41 crates.

Debug build took 15 seconds, release build took 37 seconds. Rebuilds are sub-second.

This is 0.15 nightly.

TBQH, Rust's release builds are already faster than GHC's -O0 builds for me. I'm still bereft a REPL (I live in a REPL), but it's not a deal-breaker.

> It should not recompile those crates each time, if it does, that's a bug. Please report them!

Depends on the inter-crate dependencies, alas. Touching one crate can easily cause multiple other crates to rebuild.

Only if you need to modify both crates; not if you're just adding them as dependencies, because then you're not modifying them. I was assuming that's what the parent was doing, due to their wording, but that might have been a bad assumption.

Incremental compilation is stabilizing on Nightly. It won't help the initial compile, but waiting even 5-10 Minutes when I start working on a new codebase doesn't really matter to me. It's only the incremental speed that I care about.

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