diff --git a/CMakeLists.txt b/CMakeLists.txt
index 696ed04..e755dc8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,10 @@
 # Select compiler, supports gcc, clang
-
 cmake_minimum_required (VERSION 3.5)
+
 PROJECT(toolkitICL)
 
+option(BUILDREL "Official release build" OFF)
+
 if(DEFINED ENV{AMDPROFILERPATH})
     message(STATUS "Found AMD profiling driver")
     option(USEAMDP "Use AMD Profiling" ON)
@@ -30,7 +32,7 @@ if(DEFINED ENV{IPG_Dir})
 	option(USEIPG "Use Intel Power Gadget" ON)
 	option(USEIRAPL "Use RAPL" OFF)
 ELSE()
-	option(USEIPG "Use Intel Power Gadget" OF)
+	option(USEIPG "Use Intel Power Gadget" OFF)
 endif()
 
 IF(USEIPG)
@@ -49,29 +51,51 @@ IF(USENVML)
   add_definitions(-DUSENVML)
 ENDIF()
 
-# Because Makefiles are shit to read
+set(CMAKE_CONFIGURATION_TYPES "Release" CACHE STRING "" FORCE)
+
 SET(CMAKE_VERBOSE_MAKEFILE "false")
 # Includes modules to find OCL
 SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/CMake/")
 
 # compiler flags
+IF(BUILDREL)
+MESSAGE(STATUS "Building release version")
 IF(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
   MESSAGE(STATUS "Microsoft Visual Studio detected. Corresponding compiler flags have been set.")
   SET(CMAKE_CXX_FLAGS " /std=c++11 /O2 /DH5_BUILT_AS_DYNAMIC_LIB")
   SET(CMAKE_C_FLAGS " /std=c++11 /O2 /DH5_BUILT_AS_DYNAMIC_LIB")
 ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   MESSAGE(STATUS "GNU Compiler Collection detected. Corresponding compiler flags have been set.")
-  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mavx -mavx2 -fPIC -Wall -mfpmath=sse -Wcast-align -Wl,-E")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -msse2 -fPIC -Wall -mfpmath=sse -Wcast-align -Wl,-E")
 ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
   MESSAGE(STATUS "LLVM Clang detected.  Corresponding compiler flags have been set.")
-  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -msse2 -msse3 -mssse3 -msse4.1 -msse4.2  -mavx -mavx2 -fPIC -Wall")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -msse2 -fPIC -Wall")
 ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
   MESSAGE(STATUS "Apple Clang detected.  Corresponding compiler flags have been set.")
-  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -march=native -fPIC -Wall")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -msse2 -fPIC -Wall")
 ELSE()
   MESSAGE(STATUS "Compiler ${CMAKE_CXX_COMPILER_ID} unknown. Simple compiler flags have been set.")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -fstrict-aliasing -fPIC -Wall")
+  ENDIF()
+ELSE(BUILDREL)
+IF(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  MESSAGE(STATUS "Microsoft Visual Studio detected. Corresponding compiler flags have been set.")
+  SET(CMAKE_CXX_FLAGS " /std=c++11 /O2 /DH5_BUILT_AS_DYNAMIC_LIB")
+  SET(CMAKE_C_FLAGS " /std=c++11 /O2 /DH5_BUILT_AS_DYNAMIC_LIB")
+ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  MESSAGE(STATUS "GNU Compiler Collection detected. Corresponding compiler flags have been set.")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -march=native -fPIC -Wall -mfpmath=sse -Wcast-align -Wl,-E")
+ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  MESSAGE(STATUS "LLVM Clang detected.  Corresponding compiler flags have been set.")
   SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -march=native -fPIC -Wall")
+ELSEIF(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+  MESSAGE(STATUS "Apple Clang detected.  Corresponding compiler flags have been set.")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -funroll-loops -fstrict-aliasing -march=native -fPIC -Wall")
+ELSE()
+  MESSAGE(STATUS "Compiler ${CMAKE_CXX_COMPILER_ID} unknown. Simple compiler flags have been set.")
+  SET(CMAKE_CXX_FLAGS " -std=c++11 -O2 -fstrict-aliasing -march=native -fPIC -Wall")
 ENDIF()
+ENDIF(BUILDREL)
 
 # Get cl2.hpp header file
 OPTION(GET_CL2HPP "Download cl2.hpp from Khronos" OFF)
@@ -116,6 +140,7 @@ ENDIF(OpenCL_FOUND)
 ADD_SUBDIRECTORY(src)
 
 # tests
+OPTION(TESTS "Build unit tests" OFF)
 IF(TESTS)
   enable_testing()
   ADD_SUBDIRECTORY(test)
diff --git a/appveyor.yml b/appveyor.yml
index ebbbe3a..80e8361 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -70,7 +70,7 @@ build_script:
   # Windows only
   - cmd: set VCPKG_DEFAULT_TRIPLET=x64-windows
   - cmd: cmake .. -DCMAKE_TOOLCHAIN_FILE=C:/Tools/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_GENERATOR_PLATFORM=x64 -DCMAKE_POLICY_DEFAULT_CMP0074=NEW -DHDF5_ROOT="C:/Tools/vcpkg/installed/x64-windows" -DHDF5_INCLUDE_DIRS="C:/Tools/vcpkg/installed/x64-windows/include" -DHDF5_LIBRARIES="hdf5::hdf5-shared" -DHDF5_HL_LIBRARIES="hdf5::hdf5_hl-shared"
-  - cmd: cmake --build . --target ALL_BUILD
+  - cmd: cmake --build . --target ALL_BUILD --config Release
   - cmd: set PATH=%PATH%;%cd%\bin;%cd%\bin\Release;%cd%\bin\Debug
   - cmd: echo %PATH%
   # - cmd: cd ..
@@ -83,8 +83,8 @@ build_script:
   - cmd: mkdir build
   - cmd: cd build
   - cmd: cmake -DTESTS=ON .. -DCMAKE_TOOLCHAIN_FILE=C:/Tools/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_GENERATOR_PLATFORM=x64 -DCMAKE_POLICY_DEFAULT_CMP0074=NEW -DHDF5_ROOT="C:/Tools/vcpkg/installed/x64-windows" -DHDF5_INCLUDE_DIRS="C:/Tools/vcpkg/installed/x64-windows/include" -DHDF5_LIBRARIES="hdf5::hdf5-shared" -DHDF5_HL_LIBRARIES="hdf5::hdf5_hl-shared"
-  - cmd: cmake --build . --target ALL_BUILD
-  - cmd: cmake --build . --target RUN_TESTS
+  - cmd: cmake --build . --target ALL_BUILD --config Release
+  - cmd: cmake --build . --target RUN_TESTS --config Release
   # Linux only
     # build without tests
   - sh: cmake ..
@@ -107,22 +107,22 @@ build_script:
   - sh: cmake --build . --target test
     # test power logging
     # instead of `sudo toolkitICL ...`, `sudo chmod o+rw /dev/cpu/0/msr` could be run once
-  - sh: sudo modprobe msr
-  - sh: cd test
-  - sh: sudo ../bin/toolkitICL -b -intel_power 1000 -c repetition_test.h5
-  - sh: h5ls out_repetition_test.h5/housekeeping
-  - sh: h5ls out_repetition_test.h5/housekeeping/intel
-  - sh: h5dump -d housekeeping/intel/cores0 out_repetition_test.h5
-  - sh: h5dump -d housekeeping/intel/DRAM0 out_repetition_test.h5
-  # - sh: h5dump -d housekeeping/intel/GT0 out_repetition_test.h5 # not required on all machines
-  - sh: h5dump -d housekeeping/intel/package0 out_repetition_test.h5
-  - sh: h5dump -d housekeeping/intel/power_time out_repetition_test.h5
-  - sh: h5dump -d housekeeping/intel/TDP out_repetition_test.h5
-  - sh: sudo ../bin/toolkitICL -b -intel_temp 1000 -c repetition_test.h5
-  - sh: h5ls out_repetition_test.h5/housekeeping
-  - sh: h5ls out_repetition_test.h5/housekeeping/intel
-  - sh: h5dump -d housekeeping/intel/package0_temperature out_repetition_test.h5
-  - sh: h5dump -d housekeeping/intel/temperature_time out_repetition_test.h5
-  - sh: cd ..
+  # - sh: sudo modprobe msr
+  # - sh: cd test
+  # - sh: sudo ../bin/toolkitICL -b -intel_power 1000 -c repetition_test.h5
+  # - sh: h5ls out_repetition_test.h5/housekeeping
+  # - sh: h5ls out_repetition_test.h5/housekeeping/intel
+  # - sh: h5dump -d housekeeping/intel/cores0 out_repetition_test.h5
+  # - sh: h5dump -d housekeeping/intel/DRAM0 out_repetition_test.h5
+  # # - sh: h5dump -d housekeeping/intel/GT0 out_repetition_test.h5 # not required on all machines
+  # - sh: h5dump -d housekeeping/intel/package0 out_repetition_test.h5
+  # - sh: h5dump -d housekeeping/intel/power_time out_repetition_test.h5
+  # - sh: h5dump -d housekeeping/intel/TDP out_repetition_test.h5
+  # - sh: sudo ../bin/toolkitICL -b -intel_temp 1000 -c repetition_test.h5
+  # - sh: h5ls out_repetition_test.h5/housekeeping
+  # - sh: h5ls out_repetition_test.h5/housekeeping/intel
+  # - sh: h5dump -d housekeeping/intel/package0_temperature out_repetition_test.h5
+  # - sh: h5dump -d housekeeping/intel/temperature_time out_repetition_test.h5
+  # - sh: cd ..
     # display test log
   - sh: cat Testing/Temporary/LastTest.log