Aleyda Solis discusses the importance of mobile speed for user retention and conversions at BrightonSEO, emphasizing the role of AMP (Accelerated Mobile Pages) as a solution for enhancing mobile site speed. AMP is designed to serve content quickly through a simplified HTML version, which is beneficial for media-oriented sites but is not a silver bullet for all page speed issues. The presentation includes guidelines for implementing AMP effectively, monitoring its performance, and crucial considerations to ensure a consistent user experience.