See ORMBattle.NET - High performance is usually associated with scalability. Of course, mainly indirectly: high performance is associated with the perfection of the code as a whole; being really fast involves a deep understanding of all the background problems and the ability to deal with them.
Note (or disclaimer): I am one of the individuals associated with the creation of ORMBattle.NET, as well as one of the DataObjects.Net authors.
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