A computer receives user input events associated with a network application. Each user input event corresponds to a respective image frame of the network application and the user input events include at least one remote user input event from a remote source. The computer generates and updates response data from the respective image frames associated with the user input events to a current image frame of the network application. In some embodiments, the user input events are all from a local user of the computer. The computer also generates and updates synchronization data from the respective image frame associated with the at least one remote user input event to the current image frame of the network application. Finally, the computer replaces the response data with the synchronization data.