1. A computer-implemented method to share an area of a screen, comprising: configuring, by a processor unit in a first computer system, a sharing session for sharing a region of the screen with a second computer system; assessing, by the processor unit in the first computer system, information on performance of the sharing session; determining, by the processor unit in the first computer system, from the information on performance a minimum size of the region based on the assessment; and selecting, by the processor unit in the first computer system, the region to share based on the assessment and a designation by a user.