I personally think it's good for an exchange to have slower grading. Yes, it's more annoying for the players, but Fairlay matches up people, and if they make a mistake on grading, it can cost them a lot of money if the person who won from the error withdrew, and the person who was supposed to win demands a win. As long as it's graded within 30 minutes to an hour, it should be fine for most people, and if you really want to bet, you can always deposit more.