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I want to start working on a big project. I research about performance issues about LINQ to EF and NHibernate. I want to use one of them as ORM in my project. now my question is that which one of these two ORM can get me better performance in my project? I will use SQL Server 2008 as database and C# as programming language.
Neither one will have “better performance.”
When analyzing performance, you need to look at the limiting factor. The limiting factor in this case will not be the ORM you choose, but rather how you use that tool, how you write your queries, and how you optimize the database backend.
Therefore, the “fastest” ORM will be the one which you can use correctly, coupled with the database server you best understand.
The ORM itself does have a certain amount of overhead, so the “fastest”, in terms of sheer performance, is to use none at all. However, this favors the computer’s time over at your development time, which is typically not a good trade-off. ORMs can save large amounts of your development time, while imposing only a small overhead when used correctly.
Typically when people experience performance problems when using an ORM it is because they are using the ORM incorrectly, rather than because they picked the “wrong” ORM.