5:11:13beachSome of the functionality that I am currently using full function calls for, like ENCLOSE, and now CATCH and UNWIND, could be at fixed locations in the executable. They are independent of the particular environment, so they don't have to be tied to any particular global environment. And they probably don't have to be full Common Lisp function calls, so they could use a simpler (and therefore cheaper) call protocol.
5:12:02beachBut most importantly, they don't have to become part of every static environment. And so they don't have to be processed by closure conversion.