Enable fat LTO & reduce the number of codegen units

Author: sandhose

Cargo.toml

@@ -412,6 +412,10 @@ features = ["serde"]
 [workspace.dependencies.wiremock]
 version = "0.6.2"
 
+[profile.release]
+codegen-units = 1 # Reduce the number of codegen units to increase optimizations
+lto = true        # Enable fat LTO
+
 # A few profile opt-level tweaks to make the test suite run faster
 [profile.dev.package]
 argon2.opt-level = 3