Your Restaurant City employees are one of your most valuable assets in the game, so you should take care of them. Regardless of the fact that they are your friends, (well, little avatars that represent your friends) they do work for you in your restaurant and drive your profits as well as gourmet points up!
How often should I feed Restaurant City Employees?
The more energy your employees have, the more productive they will be. It may be slightly more expensive to feed them every time they reach 75%, but it will pay off in terms of productivity. Your customers will be more satisfied and you will be able to serve more of them. You lose 25% of your energy roughly every 50 minutes, so make sure to set some type of timer to remind you to refill this if you are serious about playing.
How many Restaurant City employees should be chefs, waiters, cleaners?
If you have an efficient layout that minimizes the amount of walking between the waiter and the chef, you should as a rule always have more chefs than waiters. The reason for this is that cooking time takes a long time and the waiters can service many customers and cooks effectively. You can generally get away with one cleaner if you have bathrooms unlocked (if not yet, you don’t need a cleaner). One full time cleaner, or a part time cleaner/chef if you have time to manage switching them back and forth, can effectively service most restaurant layouts.