Enable Link-Time Optimization (LTO) and codegen-units = 1 for Release builds

[zamazan4ik]

Hi!

I noticed that in the Cargo.toml file Link-Time Optimization (LTO) for the project is not enabled. I suggest switching it on since it will reduce the binary size (always a good thing to have) and will likely improve the application's performance a bit. If you want to read more about LTO and its possible modes, I recommend starting from this Rustc documentation. Additionally, codegen-units option can help too in a similar to LTO way, so I recommend to enable it as well.

I recommend enabling LTO only for Release builds so developers experience won't be affected by the increased build time. Actually, I can propose to use flags directly from the ripgrep profile.

Basically, it can be enabled with the following lines to the root Cargo.toml file:

[profile.release]
codegen-units = 1
lto = true # FullLTO - the most aggressive LTO version

I have made quick tests (AMD Ryzen 9 5900x, Fedora 43, Rust 1.91.1, the latest version of the project at the moment, cargo build --release command, without stripping) - here are the results:

• Release (the current profile): 23 Mib, clean build time: 39s
• Release + FullLTO + CU1: 15 Mib, clean build time: 1m 36s

I think this build time overhead is okay since it affects only Release builds.

Thank you.

[anitnilay20]

Hey @zamazan4ik, here is the PR (#60). Could you have a look? Thank you

[zamazan4ik]

Everything is fine ;)