Since always; you’ve just never noticed. I’m pretty sure it’s to prevent someone from cripling the board by causing their computer to automatically post nonsense over and over.
I don’t know that it’s always been this way; it seems like I didn’t get these messages until a few board modifications ago. But yeah, this has to at least slow down people who want to spam the boards. Plus it probably stops some accidental double posts.
It was, at one time. I can recall composing messages to two separate threads and having to wait before submitting the second one.
I suspect it’s a variety of anti-spam defense that the Admins. implemented and didn’t bother making public; if you lurk during the American daytime, you may have noticed that up until recently we got our fair share of Guest spammers scattering promos. for websites across several different forums. That has seemed to be reduced lately, and I’ll bet hamburgs to hamsters that they’re related.