We recently introduced PostSharp into our code base and the compile time of our ASP.NET MVC project has doubled to quadrupled. We have about 3 MVC projects and approximately 8 class library projects in our solution.
Obviously there will be overhead associated with PostSharp since it is modifying the MSIL code. But a 2x to 4x overhead is quite an overhead.
Is this typical with PostSharp?
For the assemblies where you are sure that PostSharp will not perform any injection you can add the flag SkipPostSharp in the Conditional compilation symbols on the Build Tab for the project.
Hope this helps.