Introduction When Windows Vista was released in early 2007, a significant amount of attention was given to the new user interface called Aero, that sets out to give Windows a slicker look and feel and promises more fluid operation. But eye-candy aside, how does the new Aero interface stack up compared to older Windows releases in terms of user interface efficiency? Given the previ- ous lackluster track-record of Windows in terms of User Interface Friction, it seemed important to measure if the new release improved on some of the weak spots of previous releases, such as menu inertia and mouse precision. About this benchmark project This benchmark report presents the findings of an independently financed se- ries of benchmarks conducted by Pfeiffer Consulting. The aim of the efficiency measures was to establish if and how the recently released Windows Vista impacts User Interface Friction (UIF) and user efficiency of the Windows operating system.