one way to be a "power user" ;)
Hey, don't worry, it'll boost your usage stats here in the forums.
Seriously though, I see that same hesitation often. I've learned to just walk away (well, go to another tab) and wait it out. The odd thing is the occasions that it doesn't post, I find a log in (to tech republic) screen waiting for me.
I therefor assume the delay is in authentication. I notice it seems to fail more frequently since the forum software was changed a couple months ago.