diff --git a/CMakeLists.txt b/CMakeLists.txt
index 13ad28d..b26026a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,15 +29,21 @@ else()
     check_c_compiler_flag("-mfsca"  COMPILER_HAS_FSCA)
     if(COMPILER_HAS_FSRRA)
         set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -mfsrra")
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -mfsrra")
     endif()
     if(COMPILER_HAS_FSCA)
         set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -mfsca")
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -mfsca")
     endif()
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -ffp-contract=fast -ffast-math")
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -ffast-math")
 endif()
 
 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O3 -fexpensive-optimizations -fomit-frame-pointer -finline-functions")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -std=c++14 -fwhole-program -O3 -g0 -s -fomit-frame-pointer -fstrict-aliasing")
+
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0 -g -Wall -Wextra")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g -Wall -Wextra")
 
 set(
     SOURCES
diff --git a/README.md b/README.md
index b4b0fc7..2df585c 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ GLdc uses CMake for its build system, it currently ships with two "backends":
  - kospvr - This is the hardware-accelerated Dreamcast backend
  - software - This is a stub software rasterizer used for testing testing and debugging
  
-To compile for Dreamcast, you'll want to do something like the following:
+To compile a Dreamcast debug build, you'll want to do something like the following:
 
 ```
 mkdir dcbuild
@@ -41,6 +41,11 @@ cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/Dreamcast.cmake -G "Unix Makefiles" .
 make
 ```
 
+For a release build, replace the cmake line with with the following:
+```
+cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/Dreamcast.cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release ..
+```
+
 You will need KallistiOS compiled and configured (e.g. the KOS_BASE environment
 variable must be set)
 
diff --git a/samples/cubes/main.cpp b/samples/cubes/main.cpp
index 2fe6329..eaeeaea 100644
--- a/samples/cubes/main.cpp
+++ b/samples/cubes/main.cpp
@@ -28,27 +28,25 @@ bool isDrawingArrays = false;
 bool isBlendingEnabled = true;
 bool isRunning = true;
 
-
 typedef struct
 {
-	float r;
-	float g;
-	float b;
-	float a;
+	GLubyte r;
+	GLubyte g;
+	GLubyte b;
+	GLubyte a;
 } Color;
 
 Color colors[] =
 {
-	{1.0f, 0.0f, 0.0f, 0.5f}, // red
-	{0.0f, 1.0f, 0.0f, 0.5f}, // green
-	{0.0f, 0.0f, 1.0f, 0.5f}, // blue
-	{1.0f, 1.0f, 0.0f, 0.5f}, // yellow
-	{1.0f, 0.0f, 1.0f, 0.5f}, // magenta
-	{0.0f, 1.0f, 1.0f, 0.5f}  // cyan
+	{255, 0, 0, 128},
+	{0, 255, 0, 128},
+	{0, 0, 255, 128},
+	{255, 255, 0, 128},
+	{255, 0, 255, 128},
+	{0, 255, 255, 128}
 };
 Color faceColors[24];
 
-
 float cubeVertices[] =
 {
 	// Front face
@@ -210,7 +208,7 @@ void renderUnitCube()
 	glEnableClientState(GL_COLOR_ARRAY);
 
 	glVertexPointer(3, GL_FLOAT, 0, cubeVertices);
-	glColorPointer(4, GL_FLOAT, 0, faceColors);
+	glColorPointer(4, GL_UNSIGNED_BYTE, 0, faceColors);
 
 	if (isDrawingArrays) {
 		glDrawArrays(GL_QUADS, 0, 24);