Log in as admin Create a site with a course, a forum, and a discussion in the forum View the discussion Click "Reply" on one of the posts in the discussion to open the in page reply form Turn on the network connection throttling in your browser. The slower the network the better. This is how you do it in Chrome Type in a message to post Click the "Submit" button multiple times CONFRIM your post is only added to the page once Reload the page CONFIRM that your post is still only shown once