Rust Cargo Releasing Unoptimized Issue

Question

Why my project still saying "i am unoptimized"?

I am doing a normal build and terminal says this build is unoptimized And i am doing a release build and it says it optimized but when i enter cargo check command it says unoptimized

Answer 1

Because unoptimized + debuginfo is the default for all commands in cargo.

To run any command in release, please add the --release flag as you already did with cargo build :

cargo check --release

Answer 2

For optimized builds in debug mode add these lines to your Cargo.toml :

[profile.dev]
opt-level = 3

You can find more information about customizing build profiles here: https://doc.rust-lang.org/book/ch14-01-release-profiles.html