John Bucy Understanding OpenAFS performance OpenAFS is widely perceived as being slow. In this work, I have tried to develop a detailed understanding of the performance of OpenAFS. In the process, I have had to develop a detailed understanding of the implementation. Much of this information is not documented anywhere so I m writing it up here in the hope that it will be useful. Section 2 gives some historical background, section 3 describes the current implementation of OpenAFS, section 4 gives some experimental results and section 5 makes some recommendations for addressing some of the performance issues identified.