1. A method, comprising: receiving, over a network by a cloud gaming server computer, a request from a client device to initiate gameplay of a cloud video game; responsive to the request, assigning the client device to a first data center from which to stream the gameplay of the cloud video game; responsive to the request, initiating transfer of user save data, that is for the cloud video game and is associated with a user account associated with the client device, over the network from a second data center to the first data center; loading the cloud video game on a cloud gaming machine at the first data center, the loading of the cloud video game including loading of generic save data; initiating interactive gameplay of the cloud video game with the generic save data by streaming video data, generated from execution of the cloud video game by the cloud gaming machine, to the client device, and receiving input data from the client device to drive the execution of the cloud video game; during the interactive gameplay, completing the transfer of the user save data to the first data center; applying the user save data to update the execution of the cloud video game.