[Aiken]

No, you don't need more processor time to READ files with case sensitive/insensitive identifiers structure, but you need to double memory reservation to compare them further, because "Stuff" will refer to a different memory space that "stuff". Also if you are coding huge project and accidentally screwed your identifier/function capitalisation somewhere, you'll get a compiler error. And you are lucky guy if using Delphi/Visual Studio, if not - go check all 100000 lines of code.