Performance of “direct” virtual call vs. interface call in C#

by

I think the article Drill Into .NET Framework Internals to See How the CLR Creates Runtime Objects will answer your questions. In particular, see the section *Interface Vtable Map and Interface Map-, and the following section on Virtual Dispatch.

It’s probably possible for the JIT compiler to figure things out and optimize the code for your simple case. But not in the general case.

IFoo f2 = GetAFoo();

And GetAFoo is defined as returning an IFoo, then the JIT compiler wouldn’t be able to optimize the call.

More Related Contents:

  1. Best way to reverse a string
  2. String vs. StringBuilder
  3. How slow are .NET exceptions?
  4. Why can’t I have abstract static methods in C#?
  5. How to get object size in memory? [duplicate]
  6. Benchmarking small code samples in C#, can this implementation be improved?
  7. Does C# optimize the concatenation of string literals?
  8. Is String.Contains() faster than String.IndexOf()?
  9. LINQ: Not Any vs All Don’t
  10. What is the real overhead of try/catch in C#?
  11. String interning in .Net Framework – What are the benefits and when to use interning
  12. When is optimization premature? [closed]
  13. Why is LINQ .Where(predicate).First() faster than .First(predicate)?
  14. How do I do logging in C# without using 3rd party libraries? [closed]
  15. C# / F# Performance comparison
  16. How does extern work in C#?
  17. How performant is StackFrame?
  18. How to force a number to be in a range in C#? [duplicate]
  19. Performance of Find() vs. FirstOrDefault() [duplicate]
  20. Does String.GetHashCode consider the full string or only part of it?
  21. Warm-up when calling methods in C#
  22. LINQ performance FAQ
  23. Is it better to execute many sql commands with one connection, or reconnect every time?
  24. Why is my C# program faster in a profiler?
  25. When to use pointers in C#/.NET?
  26. When to change the Generate Serialization Assembly value?
  27. Slow SoapHttpClientProtocol constructor
  28. Fastest implementation of log2(int) and log2(float)
  29. Heap versus Stack allocation implications (.NET)
  30. Why subsequent direct method call is much faster than the first call?

Leave a Comment