diff --git a/cmake/iOS.cmake b/cmake/iOS.cmake
index 5ad71ad..03b845a 100644
--- a/cmake/iOS.cmake
+++ b/cmake/iOS.cmake
@@ -110,6 +110,7 @@
 # Hidden visibilty is required for cxx on iOS
 set (CMAKE_C_FLAGS_INIT "")
 set (CMAKE_CXX_FLAGS_INIT "-fvisibility=hidden -fvisibility-inlines-hidden")
+set (CMAKE_CXX_FLAGS_RELEASE_INIT "-DNDEBUG -O3 -fomit-frame-pointer -ffast-math")
 
 set (CMAKE_C_LINK_FLAGS "-Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
 set (CMAKE_CXX_LINK_FLAGS "-Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")