index f6224a6..8c7c45e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -203,17 +203,9 @@ if (NOT MSVC)
     add_compile_options( -g)
     add_compile_options( -pthread )
 
-    add_compile_options("$<$<CONFIG:RELWITHDEBINFO>:-O2>")
-
-    add_compile_options("$<$<CONFIG:RELEASE>:-O2>")
     add_compile_options("$<$<CONFIG:RELEASE>:-g0>")
 
     add_compile_options("$<$<CONFIG:DEBUG>:-O0>")
-
-    if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
-        set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -O2")
-        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -O2")
-    endif()
 else()
     # see https://msdn.microsoft.com/en-us/library/fwkeyyhe.aspx for details
     # /ZI = include debug info