/O1, /O2 (Minimize Size, Maximize Speed)
| Overview | How Do I | Compiler Options
Feature Only in Professional and Enterprise Editions Code optimization is supported only in Visual C++ Professional and Enterprise Editions. For more information, see .
These options select a predefined set of options that affect the size and speed of files as follows:
| Option | Equivalent to | Comment |
| /O1 (Minimize Size) | /Og /Os /Oy /Ob1 /Gs /Gf /Gy | Creates the smallest code in the majority of cases. |
| /O2 (Maximize Speed) | /Og /Oi /Ot /Oy /Ob1 /Gs /Gf /Gy | Creates the fastest code in the majority of cases. (Default setting for release builds) |
x86 Specific —>
You can use other options to improve the size or speed of many applications. For example, this option doesn’t use the /G5 option to produce code that is optimized for computers based on the Pentium processor.
These options imply the use of the Frame-Pointer Omission (/Oy) option.
END x86 Specific
To find these options in the development environment, click Settings on the Project menu. Then click the C/C++ tab, and click Optimizations in the Category box. Under Optimizations, click Maximize Speed or Minimize Size.