Assessing lag perception in electronic sketching

Braga Sangiorgi, Ugo [UCL] Genaro Motti, Vivian [UCL] Beuvens, François [UCL] Vanderdonckt, Jean [UCL]

Electronic sketching has received a recurrence of interest over the years and again nowadays within the mobile web context, where there are diverse devices, operating systems and browsers to be considered. Multi-platform (e.g. web-based) sketching systems can be constructed to allow users to sketch on their device of preference. However, web applications do not always perform equally on all devices, and this is a critical issue, especially for applications that require instant visual feedback such as sketch-based systems. This paper describes a user study conducted to identify the most appropriate response rates (expressed in frames per second) for end users while sketching. The results are expected to guide stakeholders in defining response parameters for sketching applications on the web by showing intervals that are accepted, tolerated, and rejected by end users.