build: use optimizations in packages for dev builds

Cargo.toml

@@ -109,8 +109,16 @@ monitoring_prom = ["prometheus"]
 slog_json = ["slog-json", "stacks_common/slog_json", "clarity/slog_json"]
 testing = []
 
-[profile.dev.package.regex]
-opt-level = 2
+# Use a bit more than default optimization for
+#  dev builds to speed up test execution
+[profile.dev]
+opt-level = 1
+
+# Use release-level optimization for dependencies
+# This slows down "first" builds on development environments,
+#  but won't impact subsequent builds.
+[profile.dev.package."*"]
+opt-level = 3
 
 [target.'cfg(all(any(target_arch = "x86_64", target_arch = "x86", target_arch = "aarch64"), not(target_env = "msvc")))'.dependencies]
 sha2 = { version = "0.10", features = ["asm"] }