Performance of .NET ILMerged assemblies

Posted by matt on Stack Overflow See other posts from Stack Overflow or by matt
Published on 2010-04-22T06:09:43Z Indexed on 2010/04/22 6:13 UTC
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.NET

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ilmerge

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assemblies

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Performance

I have two .NET libraries: "Foo.Bar" and "Foo.Baz".
"Foo.Bar" is self-contained, while "Foo.Baz" references "Foo.Bar".

Assuming I do the following:

Use ILMerge to merge "Foo.Bar.dll" with "Foo.Baz.dll" into "Foo1.dll".
Create a new solution containing the entirity of both "Foo.Bar" and "Foo.Baz" (since I have access to their source code), and compile this into "Foo2.dll".

Will there be any differences in the performance of Foo1.dll and Foo2.dll when using their functionality from an external project? If so, how significant is this performance difference, and is it a once-off (on load?) or ongoing difference? Are there any other pros or cons with either approach?

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