BenchmarkDotNet=v0.10.14, OS=linuxmint 18.3
Intel Core i7-4790K CPU 4.00GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
  [Host] : Mono 5.10.1.42 (tarball Wed), 64bit
  Mono   : Mono 5.10.1.42 (tarball Wed), 64bit


                               Method |         Mean |      Error |     StdDev |
------------------------------------- |-------------:|-----------:|-----------:|
                           CalliByRef |     8.774 ns |  0.1943 ns |  0.1723 ns |
                       DllImportByRef |    10.844 ns |  0.0133 ns |  0.0125 ns |
                         ManagedByRef |    12.922 ns |  0.1052 ns |  0.0984 ns |
   DelegatesWithoutDisposeChecksByRef |   948.430 ns | 17.7136 ns | 17.3971 ns |
                       DelegatesByRef |   958.051 ns |  2.0486 ns |  1.7106 ns |

                         CalliByValue |    21.163 ns |  0.0866 ns |  0.0768 ns |
                     DllImportByValue |    21.991 ns |  0.2201 ns |  0.2058 ns |
                       ManagedByValue |    22.528 ns |  0.0371 ns |  0.0347 ns |
 DelegatesWithoutDisposeChecksByValue | 1,215.534 ns |  4.5346 ns |  3.7866 ns |
                     DelegatesByValue | 1,228.969 ns |  9.6864 ns |  8.0886 ns |