diff --git a/CMakeLists.txt b/CMakeLists.txt
index fabd973..e0f9e08 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,9 @@ option(DEB   "Enable deb package build for library and executable" OFF)
 option(BREW  "Enable homebrew package build for library and executable" OFF)
 option(WASM  "Enable web assembly build" OFF)
 
+option(FASTMATH "Enable fast math"  OFF)
+option(FASTATAN "Enable fast atan2" OFF)
+
 if(MSVC)
 
   # optionally treat warnings as errors
diff --git a/cpp/StftPitchShift/LibStftPitchShift.cmake b/cpp/StftPitchShift/LibStftPitchShift.cmake
index 647b146..f206f14 100755
--- a/cpp/StftPitchShift/LibStftPitchShift.cmake
+++ b/cpp/StftPitchShift/LibStftPitchShift.cmake
@@ -67,6 +67,29 @@ target_compile_features(${PROJECT_NAME}
   PRIVATE cxx_std_20
 )
 
+if(FASTMATH)
+
+  message(STATUS "Enabling fast math")
+
+  if(MSVC)
+    target_compile_options(${PROJECT_NAME}
+      PRIVATE /fp:fast)
+  else()
+    target_compile_options(${PROJECT_NAME}
+      PRIVATE -ffast-math)
+  endif()
+
+endif()
+
+if(FASTATAN)
+
+  message(STATUS "Defining ENABLE_ARCTANGENT_APPROXIMATION")
+
+  target_compile_definitions(${PROJECT_NAME}
+    PRIVATE -DENABLE_ARCTANGENT_APPROXIMATION)
+
+endif()
+
 install(
   TARGETS ${PROJECT_NAME}
   LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"