We would like to thank Reinhard Klemm for numerous extremely helpful discussions on the subject, sharing his performance results with us and proving us with a code of WebCompanion. Our understanding of the subject was also helped by discussions with Yair Bartal. Finally, our thanks belong to Amr El Abbadi, Divy Agrawal, Tomás Dolezal, Hector Garcia-Molina, Jim Griffioen, Jaroslav Pokorný, Markus Sinnwell and Gerhard Weikum who helped us with opening accounts on their systems, installing necessary software and keeping the systems running. Without their help, the study of Web++performance would have been impossible.