Fast software fundamentally changes user behavior by enhancing productivity and reducing cognitive friction, while slow software limits efficiency and creativity. Emphasizing speed often necessitates simplifying features, leading to more focused and effective products. As industries evolve, prioritizing speed in software development will unlock new capabilities and reshape user experiences.

In 1982, the Lisa software team implemented a system to track engineers' productivity based on the lines of code written weekly. Bill Atkinson, a key developer, opposed this metric, believing it encouraged poor coding practices. After optimizing a component of the software and reducing the code by 2,000 lines, he humorously reported his productivity as -2000, leading to the management ceasing their requests for his reports.