Yes, good points MichaelGG, one of the really nice things about the F# compiler is that it can inline higher order functions, so if you pass a function to anoth

Yes, good points MichaelGG, one of the really nice things about the F# compiler is that it can inline higher order functions, so if you pass a function to another it may create a custom piece of code with your passed function inlined. I wasn't sure if you were referring to C style inline support, which C# does have (in the .NET JIT). Like C the inlining in F# is just a suggestion to the compiler. So you can write code that is optimal from a design point of view (abstractions, etc) and the compiler will turn it into optimal code from a performance point of view. See http://flyingfrogblog.blogspot.com/2009/07/ocaml-vs-f-burrows-wheeler.html http://flyingfrogblog.blogspot.com/2009/07/ocaml-vs-f-burrow... for a much better explanation.