Entity Framework performance issue

There seems to some significant concern over the Entity Framework of .Net.

Refer these link for more detail

http://blogs.msdn.com/dparys/archive/2009/04/06/improving-entity-framework-performance.aspx

http://toomanylayers.blogspot.com/2009/01/entity-framework-and-linq-to-sql.html

Interestingly NHibernate seems to outperform Entity Framework.