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copied!<p>I'm not sure how accurate the following infomrationis with newer versions of .NET and/or Windows versions. MS may have addressed some of the DLL loading/sharing issues since the early days of .NET. But I believe that much of the following still does apply.</p> <p>With .NET assemblies a lot of the benefit of page sharing between processes (and between Terminal server sessions) disappears because the JIT needs to write the native code on the fly - there's no image file to back up the native code. So each process gets it's own, separate memory pages for the jitted code.</p> <p>This is similar to the issues that are caused by having DLLs improperly based - if the OS needs to perform fixups on a standard Win32 DLL when it's loaded, the memory pages for the fixed up portions cannot be shared.</p> <p>However, even if the jitted code cannot be shared, there is a benefit to rebasing .NET DLLs because the DLL is still loaded for the metadata (and IL) - and that stuff can be shared if no fixups are required.</p> <p>It's possible to help share memory pages with a .NET assembly by using ngen. but that brings along its own set of issues.</p> <p>See this old blog post by Jason Zander for some details:</p> <p><a href="http://blogs.msdn.com/jasonz/archive/2003/09/24/53574.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/jasonz/archive/2003/09/24/53574.aspx</a></p> <p>Larry Osterman has a decent blog article on DLL page sharing and the effect of fixups:</p> <p><a href="http://blogs.msdn.com/larryosterman/archive/2004/07/06/174516.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/larryosterman/archive/2004/07/06/174516.aspx</a></p>

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