falingtrea, thank you for your detailed answer. (Un)fortunately I left assembler behind me a few years ago when I started with PBP. And I would like to not go back.

So do you all agree that it is roughly 3uS per loop as T.Jackson states?

Offtopic:
I am sure that T.Jackson has his reasons to react the way he did.

Coming from his kind of answer compared to all answers in this thread, Acetronics does have mental issues.

It is something between T.Jackson and Acetronics, and you were not invited to be a freeloader, skimask. So stay out of this.