Add a debug and release profile

Cargo.toml

@@ -5,9 +5,6 @@ authors = ["{{ authors }}"]
 edition = "2021"
 license = "MIT OR Apache-2.0"
 
-[profile.release]
-debug = true
-
 [dependencies]
 {{ mcu }}-hal = "{{ hal_version }}"
 esp-backtrace = { version = "0.11.0", features = ["{{ mcu }}", "panic-handler", "exception-handler", "println"] }
@@ -32,3 +29,17 @@ heapless = { version = "0.8.0", default-features = false }
 [features]
 default = ["{{ mcu }}-hal/xtal-40mhz"]
 {% endif %}
+
+[profile.dev]
+# Rust debug is too slow. 
+# For debug builds always builds with some optimization
+opt-level = "s"
+
+[profile.release]
+codegen-units = 1 # LLVM can perform better optimizations using a single thread
+debug = 2
+debug-assertions = false
+incremental = false
+lto = 'fat'
+opt-level = 's'
+overflow-checks = false