Technologies are generally described for methods and systems effective to associate composition data with a graphics processing unit so that a corresponding model may be manipulated and an image produced. According to some examples, the methods may include receiving, by a dispatcher, first composition data that corresponds to a first model. The methods may also include associating, by the dispatcher, the first composition data with a first graphics processing unit. The methods may also include receiving, by the dispatcher, second composition data that corresponds to a second model. The methods may include determining, by the dispatcher, that the second model is stored in a second graphics processing unit different from the first graphics processing unit. The methods may also include associating, by the dispatcher, the second composition data with the second graphics processing unit based on the determination that the second model is stored in the second graphics processing unit.