I just started a game (#2584279), and we had to end it very early because it was unplayable. To be percise, one had to refresh the browser after (or rather, before) every action, as it wouldn't update after an action was taken. A turn would be, at best: Play treasures, refresh, buy card, refresh, wait for the other player to refresh and then play his turn. Actions, of course, would make it much worse.