add optimization flag for MSVC and heavy tests

remove unsupported namespace

test/CMakeLists.txt

@@ -83,6 +83,8 @@ if(CMAKE_COMPILER_IS_GNUCXX)
     set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g2")
   endif(CMAKE_SYSTEM_NAME MATCHES Linux)
   set(EI_OFLAG "-O2")
+elseif(MSVC)
+  set(EI_OFLAG "/O2")
 else(CMAKE_COMPILER_IS_GNUCXX)
   set(EI_OFLAG "")
 endif(CMAKE_COMPILER_IS_GNUCXX)