release profile: thin lto, cgu=1, strip

Cargo.toml

@@ -143,3 +143,8 @@ debug = 1                    # line tables only — still debuggable, much faste
 
 [profile.dev.package."*"]
 opt-level = 2                # compile deps faster at runtime; paid once, cached after
+
+[profile.release]
+codegen-units = 1
+lto = "thin"
+strip = true