performance optimization in 54

src/euler54/Cargo.toml

@@ -11,8 +11,6 @@ path = "src/lib.rs"
 name = "euler54"
 path = "src/main.rs"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 rstest = "*"
 
@@ -21,6 +19,8 @@ criterion = "*"
 
 [profile.release]
 debug = true
+lto = true
+codegen-units = 1
 
 [[bench]]
 name = "benchmark"