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LINQ in a child app of AppDomain

Does anyone have an idea why compiling the JIT LINQ expression takes longer in the child AppDomain than in the default AppDomain? Up to 4 times longer.

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Although without actual profiling I can only make the following assumptions

  • There is a small amount of overhead creating the new AppDomain
  • A child of AppDomain will have to restart all necessary assemblies again.
  • If you then copy the expression back to the parent AppDomain, then you will get serialization.
  • If you pass the compiled lambda method, you will be amazed at the cost of loading the dynamic assembly into the parent AppDomain.
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