The main goal of this article is to provide a critical reflection on what computing may contribute to an open understanding of performance in architecture. We propose a phenomenological approach to computing since it combines several concepts concerning the user’s experience of space. In order to study the human movement in space, we will present the results of a sequence of applications using open source software Processing, including time-lapse movies, frame differencing analysis and blending images tools. The research used the context of a existent building at the campus of Universidade Federal do Espírito Santo. A series of interviews with users were also conducted in order to validate the computing analysis.