Multiplier delivers results almost always instantly. Uncommonly, numbers keep mixing for too long without showing any results. Then it might be a temporary interruption on your internet or the server, who knows... Anyway, it's not enough to annoy a gambling session, although it's sufficient to chill down the spine.
 
Sometimes the history of bets takes a while to update. I've seen this happening to me twice, but I assume it's normal... You just have to refresh the page few times and wait some seconds or a minute and the history will be shown correctly.