A quick and dirty comparison on my project:

    -- GNU Ld 2.31.1
 >> cargo build --release
       Compiling mfl v0.1.0 (/mnt/d/Programming/Projects/Rust/mfl/crates/mfl)
        Finished release [optimized + debuginfo] target(s) in 10.14s
 
    -- LLD-14
    >> cargo build --release
       Compiling mfl v0.1.0 (/mnt/d/Programming/Projects/Rust/mfl/crates/mfl)
        Finished release [optimized + debuginfo] target(s) in 6.20s
 
    -- Mold 2.0
    >> cargo build --release
       Compiling mfl v0.1.0 (/mnt/d/Programming/Projects/Rust/mfl/crates/mfl)
        Finished release [optimized + debuginfo] target(s) in 6.02s

I did the following for each test:

    cargo clean
    cargo build --release
    touch crates/mfl/src/main.rs
    cargo build --release

With the timings coming from the second build. The project links in LLVM, and the tests were done under WSL1 on Windows 10 with the files on the Windows file system, which is how the project is developed in general.

About a year ago, I was seeing incremental builds go from ~8s to ~2.7s with Mold. Huge quality of life improvement.

(fairly large Rust project, 24-core machine, Linux)

Personal anecdote: linking a debug build of buck2 (big Rust codebase) went from 30s to 3s for me. Pretty wonderful.