This document summarizes a webinar presented by Courtney Ball, Antonio Contreras, and Whelan Boyd from 23andMe on how the company improved user experience through A/B testing and implemented Performance Edge to optimize page load times. The webinar discussed how website performance directly impacts business metrics like conversion rates, highlighted best practices for measuring performance, and explained how standard A/B testing can negatively affect page speeds. It then introduced Performance Edge as a solution that delivers only necessary code variations to visitors, significantly reducing file sizes and browser execution times. 23andMe's case study showed how implementing Performance Edge through Cloudflare Workers dramatically improved their page load performance metrics and allowed them to scale up testing without slowing down