diff --git a/Cargo.toml b/Cargo.toml
index 5670627..77c2678 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,3 +34,15 @@ members = [
     "schemes/udpd",
     "syscall"
 ]
+
+[profile.dev]
+debug = true
+debug-assertions = true
+lto = false
+opt-level = 0
+
+[profile.release]
+debug = false
+debug-assertions = false
+lto = true
+opt-level = 3
diff --git a/mk/config.mk b/mk/config.mk
index 0b1b9c9..5b11f72 100644
--- a/mk/config.mk
+++ b/mk/config.mk
@@ -21,7 +21,7 @@ BUILD=build/userspace
 RUSTC=./rustc.sh
 RUSTDOC=./rustdoc.sh
 CARGO=RUSTC="$(RUSTC)" RUSTDOC="$(RUSTDOC)" cargo
-CARGOFLAGS=--target $(TARGET) --release -- -C codegen-units=`nproc`
+CARGOFLAGS=--target $(TARGET) --release --
 
 # Per host variables
 UNAME := $(shell uname)
diff --git a/mk/kernel.mk b/mk/kernel.mk
index 814fed7..6a716f6 100644
--- a/mk/kernel.mk
+++ b/mk/kernel.mk
@@ -1,6 +1,6 @@
 $(KBUILD)/libcollections.rlib: rust/src/libcollections/Cargo.toml rust/src/libcollections/**
 	mkdir -p $(KBUILD)
-	$(KCARGO) rustc --verbose --manifest-path $< $(KCARGOFLAGS) -o $@
+	$(KCARGO) rustc --manifest-path $< $(KCARGOFLAGS) -o $@
 	cp rust/src/target/$(KTARGET)/release/deps/*.rlib $(KBUILD)
 
 $(KBUILD)/libkernel.a: kernel/Cargo.toml kernel/arch/** kernel/src/** $(KBUILD)/libcollections.rlib $(BUILD)/initfs.rs
diff --git a/mk/userspace/mod.mk b/mk/userspace/mod.mk
index b399ca2..7a7e503 100644
--- a/mk/userspace/mod.mk
+++ b/mk/userspace/mod.mk
@@ -28,12 +28,12 @@ include mk/userspace/userutils.mk
 
 $(BUILD)/libstd.rlib: rust/src/libstd/Cargo.toml rust/src/libstd/**
 	mkdir -p $(BUILD)
-	$(CARGO) rustc --verbose --manifest-path $< --features "panic-unwind" $(CARGOFLAGS) -L native=libc-artifacts/usr/lib -o $@
+	$(CARGO) rustc --manifest-path $< --features "panic-unwind" $(CARGOFLAGS) -L native=libc-artifacts/usr/lib -o $@
 	cp rust/src/target/$(TARGET)/release/deps/*.rlib $(BUILD)
 
 $(BUILD)/libtest.rlib: rust/src/libtest/Cargo.toml rust/src/libtest/** $(BUILD)/libstd.rlib
 	mkdir -p $(BUILD)
-	$(CARGO) rustc --verbose --manifest-path $< $(CARGOFLAGS) -L native=libc-artifacts/usr/lib -o $@
+	$(CARGO) rustc --manifest-path $< $(CARGOFLAGS) -L native=libc-artifacts/usr/lib -o $@
 	cp rust/src/target/$(TARGET)/release/deps/*.rlib $(BUILD)
 
 filesystem/bin/%: programs/%/Cargo.toml programs/%/src/** $(BUILD)/libstd.rlib