Wow - that's a bold (and, IMO, largely uninformed) claim. I would Apple does a fine job of writing efficient software. And what's with lumping Firefox in with "Apple Software?" Apple has less than nothing to do with Firefox and its development.
Edit: It occurs to me that I could be misreading your tone and meaning in a huge way, and if I am, I apologize for the snappy response. If you didn't mean it how I read it, how did you mean it?