One more I mentioned in the Museum Level 5 slowpoke walkthrough...
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If one table is asking for snacks and another is asking for dessert and everyone is pretty happy give the snacks first. This is because a table that asks for snack will often ask for dessert afterwards (this is especially true of teens), but once someone asks for dessert they're going to ask for the check next. So you have a chance at a longer dessert chain by giving the snack first.
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If everyone is pretty happy, when you see one person ask for dessert, look at the other tables and see if others are close to finishing eating their main course. If they are, wait by the dessert stand until you get two requests--this will save you a trip back.
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Do the same thing when picking up food orders--if everyone is pretty happy, wait by the counter until you have two to deliver.
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The exception to the "two per trip" is when you're trying to clear a specific table, like maybe the reservation table, particularly quickly or when you have an odd number of tables anyway and you know you'll have to make one trip of just one (in which case it might as well be the first one). So this isn't a hard and fast rule, it's just a good idea most of the time.
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When possible (it's not always), combine trips to the same part of the restaurant. But if you can serve people in the same section at about the same time, you may find they both ask for desserts or checks at about the same time, which can help.
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Once the food has been served when you have nothing to do, stand one of two places--at the podium to make guests in line happy, or near the snacks and dessert stand, to be ready when guests start asking for these.
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Some slowpoke tips for the waitress competitions
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In the waitress competitions, the slowpoke strategy is to anticipate the high points requests. So stand near the snack stand so you're ready to give those--they're worth more than picking up orders. And as soon as someone is close to finishing, go over to get their check.
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Remember that on the waitress competition levels your biggest advantage is that the other waitress will go to get dessert and you can take the customer's check right away, without giving dessert. Also, one other strategy--some of the competing waitresses seem to get confused if you have a chain of food deliveries going, and they'll just stand there. So it's a good idea to deliver food also.
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On waitress levels I'll stand by the snack stand. If someone asks for a snack, click the stand. If a food order is just coming out, pick it up, too. Deliver the snack, deliver the food, go back to the counter for the next food orders. Deliver as many food orders as I can, then go back to the snack station. As people start to finish, pick up checks and dishes. I try to get chains of two checks then two dishes but it's more important to get the second check.
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Faster people can get a lot of points on the waitress levels by also seating customers but I've found that usually takes too much time for me. I'll do it if it's easy but otherwise I concentrate on snacks, food deliveries, and picking up checks and dishes. I'll pick up an order if I happen to be going past that table anyway, since it helps break up the competing waitress' chain, but I won't usually make a special trip to pick up orders. Snacks are worth it, though.
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Good luck!

thannnk you