title: LINQ performance FAQ
body: <p>I am trying to get to grips with LINQ.  The thing that bothers me most is that even as I understand the syntax better, I don't want to unwittingly sacrifice performance for expressiveness.  </p>
  
  <p>Are they any good centralized repositories of information or books for 'Effective LINQ' ?  Failing that, what is your own personal favourite high-performance LINQ technique ?</p>
  
  <p>I am primarily concerned with LINQ to Objects, but all suggestions on LINQ to SQL and LINQ to XML also welcome of course.  Thanks.</p>