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    <p>Take a look at here:</p> <p><a href="http://thatstoday.com/robbanp/blog/6/25/csharp-performance--cast-vs-interface" rel="noreferrer">http://thatstoday.com/robbanp/blog/6/25/csharp-performance--cast-vs-interface</a></p> <p>And, yes, you seem to be right.</p> <p><strong>Edit</strong> Well, it seems that I was wrong. And like my "patrício" Martinho Fernandes commented bellow, the above link is completely bogus (but I'll keep it here, for the sake of honest editing).</p> <p>I do have some spare time nowadays, so I've written a simple performance measuring code:</p> <pre><code>public partial class Form1 : Form { private const int Cycles = 10000000; public interface IMyInterface { int SameProperty { get; set; } } public class InterfacedClass : IMyInterface { public int SameProperty { get; set; } } public class SimpleClass { public int SameProperty { get; set; } } public struct InterfacedStruct : IMyInterface { public int SameProperty { get; set; } } public struct SimpleStruct { public int SameProperty { get; set; } } public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { var simpleClassTime = MeasureSimpleClass(); var interfacedClassTime = MeasureInterfacedClass(); var simpleStructTime = MeasureSimpleStruct(); var interfacedStructTime = MeasureInterfacedStruct(); var message = string.Format( "simpleClassTime = {0}\r\ninterfacedClassTime = {1}\r\nsimpleStructTime = {2}\r\ninterfacedStructTime = {3}", simpleClassTime, interfacedClassTime, simpleStructTime, interfacedStructTime ); textBox.Text = message; } private static long MeasureSimpleClass() { var watch = Stopwatch.StartNew(); var obj = new SimpleClass(); for (var i = 0; i &lt; Cycles; i++) { obj.SameProperty = i; var j = obj.SameProperty; obj.SameProperty = j; } return watch.ElapsedMilliseconds; } private static long MeasureInterfacedClass() { var watch = Stopwatch.StartNew(); IMyInterface obj = new InterfacedClass(); for (var i = 0; i &lt; Cycles; i++) { obj.SameProperty = i; var j = obj.SameProperty; obj.SameProperty = j; } return watch.ElapsedMilliseconds; } private static long MeasureSimpleStruct() { var watch = Stopwatch.StartNew(); var obj = new SimpleStruct(); for (var i = 0; i &lt; Cycles; i++) { obj.SameProperty = i; var j = obj.SameProperty; obj.SameProperty = j; } return watch.ElapsedMilliseconds; } private static long MeasureInterfacedStruct() { var watch = Stopwatch.StartNew(); IMyInterface obj = new InterfacedStruct(); for (var i = 0; i &lt; Cycles; i++) { obj.SameProperty = i; var j = obj.SameProperty; obj.SameProperty = j; } return watch.ElapsedMilliseconds; } } </code></pre> <p>And the result is:</p> <pre><code>simpleClassTime = 274 interfacedClassTime = 339 simpleStructTime = 247 interfacedStructTime = 302 </code></pre> <p>I really used to think that an interface would be faster for <code>class</code> types, and slower for <code>struct</code> (since boxing/unboxing is involved in the latter), but that is not the case: a concrete class/struct reference is always faster, it seems.</p> <p>Also, to whom it may concern: I believe that performance is <strong>not</strong> a good criteria for deciding if an interface should or should not be used. The difference is, like others said here, negligible.</p>
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    1. CO@Martinho Fernandes: wow, a simple "You are wrong" would suffice. Again, "it is like hitting a dead horse", indeed. :-) I'll try to find a more relevant link, stay tuned.
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    2. COI find "You are wrong" without an explanation to be rude. That's like a downvote without an explanation.
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    3. CO@Martinho Fernandes: Well, you were rude all the same; you just took a little longer to get there. But, please, take a look at my edited answer. You were right, I was wrong, so *mea maxima culpa*.
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