Starbucks (SBUX.US) has made changes to its mobile order rules to enhance service efficiency.

Starbucks (SBUX.US) is putting some limits on mobile orders as part of a broader plan to speed up service. The coffee chain is reducing the beverage limit on each order to 12 from 15 and removing the ability to add milk or lemonade to its classic Refreshers, as those drinks are already on the menu. It is also removing the decaf option for American coffee.