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Asked: 2026-05-15T18:37:31+00:00

In Visual Studio C/C++ projects, it’s easy to modify compiler’s optimization settings in Property

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In Visual Studio C/C++ projects, it’s easy to modify compiler’s optimization settings in “Property Pages | C/C++ | Optimization”. For example, we may give different optimization levels such as /O2 and /O3, as well as advanced optimizations like “Omit Frame Pointers”.

However, I can’t simply find corresponding UIs in C# project of Visual Studio. All I can find is just turning off optimizations: the “Optimize code” check box is all I’ve got.

Can C# users control detailed compiler’s optimizations like C/C++? Do I have to give compiler options in command line?

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  1. Editorial Team

    Much of the optimisation of C# code goes on at the JIT compiler level, rather than the C# compiler. Basically there are no such detailed settings as the ones available in C or C++.

    There are a few performance-related elements of the runtime that can be tweaked, such as GC strategies, but not a great deal.

    When I’m building benchmark tests etc from the command line I tend to just use something like this:

    csc /o+ /debug- Test.cs

    (I believe I have seen the presence of a matching pdb file make a difference to performance, possibly in terms of the cost of exceptions being thrown, hence the debug- switch… but I could be wrong.)

    EDIT: If you want to see the difference each bit of optimization makes, there’s one approach which could prove interesting:

    • Compile the same code with and without optimization
    • Use ildasm or Reflector in IL mode to see what the differences are
    • Apply the same changes one at a time manually (using ilasm) and measure how much each one has
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