Tammy Everts is Chief Experience Officer at SpeedCurve, where she helps companies explore the intersection between website performance, user experience, and business metrics. Tammy has spent more than two decades studying how people use the web. Over the years, she has worked on groundbreaking studies that involved EEG headsets, facial action coding, and Google's machine-learning system. Her book, Time Is Money: The Business Value of Web Performance (O'Reilly), is a distillation of much of this research. She is co-chair of the annual performance.now() conference. She also co-curates WPO Stats, a collection of performance case studies.