Does anyone know about what kind of optimizations LINQ gets in the VM? Does it do something like stream fusion? I wish MS had decided to make .Net multiplatform, there are a lot of really great things on there, but Windows just isn't my cup of tea.
I don't believe the VM is aware of LINQ at all. As far as optimization, there's no guarantee to pureness with CLR code, so the compiler/JIT cannot do very much. (That is, a query composed of multiple parts cannot be turned into a nice simple loop.) The generated code creates enumerable objects, and possibly closure objects which are called via delegates.
