The main drawback of the game is that you have to wait too long for dishes to complete to serve the customers. This limitation does not enhance playability. This game is top of class to other cooking games and management games but lacks in regard to waiting time.
In response to the developers I already tried the VIP lounge which only can be used after in app purchase. The VIP lounge does not make the cooking times faster you do get extra coins, like 3% but gets higher if you purchase more extra or cash (3% or more) if you watch an add and get a certain percentage of your cash back when you purchase appliances for example. This does not help with the cooking times.
When this problem is solved without having to purchase the Booster 5 stars are guaranteed in a next review.