Accelerate user interaction

Since even leaving the system idle consumes a lot of energy, reducing the usage time for a task seems to be the most effective way of energy reduction. Therefore, a GUI should be designed for maximum work within a given amount of time. For example, the most frequently used programs or functions should be placed in the GUI so that users can find them quickly instead of after activating a series of windows. Fortunately, fast access to functionalities is also a primary concern for traditional GUI design [12] (pp. $62$-$78$). Note that user interaction acceleration is different from improving GUI responsiveness, another primary concern of traditional GUI design for performing screen changes.