The claim that it compiles faster is bogus - prove me wrong. Most compile time from spring4d comes from generics, which I reported years ago.
Also, my suggestion for third-party libraries is to pre-compile them, which removes any dependency on the project options in your project.
Currently, Spring4d supports down to XE, and as long as that is the case, I am not putting even more conditionals into the code than there already are.