Compiler optimizations make your output file smaller, faster, and more efficient. However, because optimizations result in code rearrangement in the output file, /optimize+ can make debugging difficult.
All modules generated with /target:module for an assembly must use the same /optimize settings as the assembly. For more information, see /target (Visual Basic).
You can combine the /optimize and /debug options.
To set /optimize in the Visual Studio integrated development environment
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Have a project selected in Solution Explorer. On the Project menu, click Properties.
For more information, see Introduction to the Project Designer.
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Click the Compile tab.
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Click the Advanced button.
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Modify the Enable optimizations check box.