Explore the impact of service workers on the energy efficiency of Progressive Web Apps (PWAs) in this conference talk from AmsterdamJS 2017. Delve into an empirical study conducted by Ivano Malavolta, Assistant Professor at Vrije Universiteit Amsterdam, comparing PWAs to native apps in terms of user experience and energy consumption. Learn about the components of PWAs, the role of service workers, and the concept of offline-first experiences. Examine the experiment design, measurement infrastructure, and results across different devices and network conditions. Gain insights into the promising potential of PWA technology for energy efficiency in mobile web applications.