Well no, they're certainly not actual secrets. I used the word for two reasons: first, to convey that which mechanisms are actually used in Swift aren't well known yet, and secondly and much more importantly, to make the title alliterative.
Alliteration is always a good reason :)
I shouldn't have been so short with you. I've just seen one to many articles where Swift is made to be seen as Apple's godly gift to software development, without any references to similar languages. Not that yours is that ofcourse, it just triggered that frustration a bit :)
I understand and share your frustration. This article is my attempt to counter the "Swift is super fast because rainbows and unicorns" attitude floating around.
And for the record, I didn't see your comment as "short". You explained some good context, and I just thought I'd explain my word choice in turn, especially since I could joke about it.
I'm sorry to spoil your alliteration, but in addition to this not being secrets, it isn't speed either (yet), as the second paragraph makes clear. So (as the HN guidelines ask) we changed the title to a phrase from the article that seems more accurate and neutral.
I disagree with the characterization as "baity", as I never write with any intent to attract links. However, your site, your rules, and I don't care what title you use here.