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I'd have to say that performance is maddeningly inconsistent. I just replied to something, hit the Post Quick Reply button, then waited. Eventually, I got that dialog about navigating away from the page. I'm not sure whether it matters which one you choose, but I chose the one for going ahead with leaving the page. I then went to eat lunch, as nothing was happening. When I got back, I was still looking at my quick reply, as if it hadn't posted at all. I hadn't navigated anywhere. Fortunately, I knew enough not to hit Post Quick Reply again, but just reloaded the thread. Sure enough, my post was there. Had I hit the button, as one might reasonably do, since nothing appeared to happen the first time I hit it, I would have had a double post.

This happens rarely, but not so rare that I haven't learned what to do. If a problem happens often enough that you learn a coping mechanism, it's a real problem. I would say that it will happen once in any half hour spent at the site. It only happens once, though, because I usually get tired of watching that wait cursor, and leave, so it is generally the last thing I do before closing my browser or going elsewhere.