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Is there a full list of optimizations done by the /optimize C# compiler key available anywhere?
EDIT:
Why is it disabled by default?
Is it worth using in a real-world app? — it is disabled by default only in Debug configuration and Enabled in Release.
Scott Hanselman has a blog post that shows a few examples of what /optimize (which is enabled in Release Builds) does.
As a summary: /optimize does many things with no exact number or definition given, but one of the more visible are method inlining (If you have a Method A() which calls B() which calls C() which calls D(), the compiler may “skip” B and C and go from A to D directly), which may cause a “weird” callstack in the Release build.