Add a debug and release profile

Cargo.toml

@@ -32,3 +32,17 @@ 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