Many scientific applications use the X11 windows environment-an open source windows standard employing a client/server architecture. This paper is a detailed report of the author's investigations into close encounters with alien performance in X11R5 seismic applications running on a large-scale cluster platform. End-users cited two significant UFOs (Unidentified Faulty Operations) a) long application launch times and b) poor interactive response times. The paper is divided into three areas corresponding to Close Encounters of the 1st Kind: citings of UFO experiences, the 2nd Kind: recording evidence of a UFO, and the 3rd Kind: contact and analysis. UFOs do exist and this paper presents the systematic approache employed in their detection and removal.
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