Abstract: A network system comprising multiple client devices and a central processing device is provided. The central processing device includes: a central processing unit (CPU), to receive state data derived from streaming data relating to multiple client objects and being generated at the client devices. The central processing device further includes a graphics processing unit (GPU) including a data store for storing attributes of each client object. The CPU forwards to the GPU, the received state data as update information relating to the client objects. The GPU: receives the update information from the CPU, updates the attributes in the data store using the update information, for each of the client objects to which the update information relates, performs, for each client object, rendering using the attributes of the client object stored in the data store to display, on a display device, multiple image objects corresponding to the client objects.