I want an article form a trustable source like microsoft comparing each different .NET language in terms of speed.

Also, any information reguarding .NET's memory management would be appreciated. I know VB and C# use garbage collection (*shudder*) but C++ will use RAII. Since the .NET framework was done in C++, does all of their components use RAII as well? Does a managed C++ program use RAII or garbage collection built into .NET?