diff --git a/build_mingw32 b/build_mingw32
index 347550416..abd09ff07 100755
--- a/build_mingw32
+++ b/build_mingw32
@@ -1,6 +1,7 @@
 MINGW=/opt/mingw32
 export PATH=$PATH:$MINGW/bin
-export CFLAGS="-march=pentium3 -mtune=generic -mpreferred-stack-boundary=5 -fno-tree-vectorize"
+#export CFLAGS="-march=pentium3 -mtune=generic -mpreferred-stack-boundary=5 -fno-tree-vectorize"
+export CFLAGS="-march=pentium3 -mtune=generic -mpreferred-stack-boundary=5"
 export CXXFLAGS="$CFLAGS"
 cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/modules/Win32Toolchain.cmake -DCMAKE_MODULE_PATH=`pwd`/../cmake/modules/
 
diff --git a/build_mingw64 b/build_mingw64
index 3d74cad37..32c86d42e 100755
--- a/build_mingw64
+++ b/build_mingw64
@@ -1,6 +1,6 @@
 MINGW=/opt/mingw64
 export PATH=$PATH:$MINGW/bin
-export CFLAGS="-fno-tree-vectorize"
+#export CFLAGS="-fno-tree-vectorize"
 export CXXFLAGS="$CFLAGS"
 cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/modules/Win64Toolchain.cmake -DCMAKE_MODULE_PATH=`pwd`/../cmake/modules/
 
diff --git a/plugins/vst_base/CMakeLists.txt b/plugins/vst_base/CMakeLists.txt
index d3d3d5c41..6412121a0 100644
--- a/plugins/vst_base/CMakeLists.txt
+++ b/plugins/vst_base/CMakeLists.txt
@@ -6,6 +6,7 @@ IF(LMMS_BUILD_WIN32)
 	ADD_DEFINITIONS(-DPTW32_STATIC_LIB)
 	ADD_EXECUTABLE(RemoteVstPlugin ${CMAKE_CURRENT_SOURCE_DIR}/RemoteVstPlugin.cpp)
 	TARGET_LINK_LIBRARIES(RemoteVstPlugin -lQtCore4 -lpthread -lgdi32 -lws2_32)
+	SET_TARGET_PROPERTIES(RemoteVstPlugin PROPERTIES COMPILE_FLAGS "${COMPILE_FLAGS} -O3")
 	ADD_CUSTOM_COMMAND(TARGET RemoteVstPlugin POST_BUILD COMMAND ${STRIP} ${CMAKE_CURRENT_BINARY_DIR}/RemoteVstPlugin.exe)
 	INSTALL(TARGETS RemoteVstPlugin RUNTIME DESTINATION ${PLUGIN_DIR})
 
diff --git a/plugins/vst_base/Win64/CMakeLists.txt b/plugins/vst_base/Win64/CMakeLists.txt
index af96b3a28..3f151e363 100644
--- a/plugins/vst_base/Win64/CMakeLists.txt
+++ b/plugins/vst_base/Win64/CMakeLists.txt
@@ -5,6 +5,7 @@ ADD_EXECUTABLE(RemoteVstPlugin32 ${CMAKE_CURRENT_SOURCE_DIR}/../RemoteVstPlugin.
 TARGET_LINK_LIBRARIES(RemoteVstPlugin32 -lQtCore4 -lpthread -lgdi32 -lws2_32)
 
 ADD_CUSTOM_COMMAND(TARGET RemoteVstPlugin32 POST_BUILD COMMAND ${STRIP} ${CMAKE_CURRENT_BINARY_DIR}/RemoteVstPlugin32.exe)
+SET_TARGET_PROPERTIES(RemoteVstPlugin32 PROPERTIES COMPILE_FLAGS "${COMPILE_FLAGS} -O3")
 
 INSTALL(TARGETS RemoteVstPlugin32 RUNTIME DESTINATION ${PLUGIN_DIR}/32)