A request is received for an image to be presented on a client computing device, where the image is synthesized by shared images and dedicated images dedicated to the client computing device. A first one or more source files are identified for generating the shared images that are used by the client computing device and one or more other client computing devices. The shared images are generated based on the first one or more source files. A second one or more source files are identified for generating the dedicated images. A configuration file is generated that includes instructions for the client computing device to synthesize the shared images and the second one or more source files to the requested image. The shared images, the second one or more source files, and the configuration file are sent to the client computing device.