Field vs Property. Optimisation of performance

As others have already mentioned, the getters are inlined.

If you want to avoid inlining, you have to

• replace the automatic properties with manual ones:

  class A 
  {
      private double p;
      public double P
      {
          get { return p; }
          set { p = value; }
      }
  } 
  

• and tell the compiler not to inline the getter (or both, if you feel like it):

          [MethodImpl(MethodImplOptions.NoInlining)]
          get { return p; }
  

Note that the first change does not make a difference in performance, whereas the second change shows a clear method call overhead:

Manual properties:

auto getter. 519005. 10000971,0237547.
      field. 514235. 20001942,0475098.

No inlining of the getter:

auto getter. 785997. 10000476,0385552.
      field. 531552. 20000952,077111.