Feature Only in Professional and Enterprise Editions Code optimization is supported only in Visual C++ Professional and Enterprise Editions. For more information, see Visual C++ Editions.
/Od
This option turns off all optimizations in the program and speeds compilation. This option is the default. Because /Od suppresses code movement, it simplifies the debugging process. For information on the compile-for-debugging options, see /Zi, /Z7, and /Zd.
/O options (Optimize Code) | Compiler Options | Setting Compiler Options