Performance
Performance of delegates used to be much slower than a virtual or interface method call (6 to 8 times slower in Microsoft's 2003 benchmarks), but, since the .NET 2.0 CLR in 2005, it is about the same as interface calls. This means there is a small added overhead compared to direct method invocations.
There are very stringent rules on the construction of delegate classes. These rules permit optimizing compilers a great deal of leeway when optimizing delegates while ensuring type safety.
Delegates are a variation of closures.
Read more about this topic: Delegate (.NET)
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