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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“The honor my country shall never be stained by an apology from me for the statement of truth and the performance of duty; nor can I give any explanation of my official acts except such as is due to integrity and justice and consistent with the principles on which our institutions have been framed.”
—Andrew Jackson (1767–1845)
“No performance is worth loss of geniality. ‘Tis a cruel price we pay for certain fancy goods called fine arts and philosophy.”
—Ralph Waldo Emerson (1803–1882)