GrowthBook 3.0 introduces significant advancements, including new Edge SDKs for Cloudflare, Fastly, and Lambda, which facilitate seamless A/B testing by modifying HTML before it reaches users, thereby eliminating flickering and other common issues. The update also enhances Bayesian statistics with custom priors and introduces CUPED support, improving accuracy and reducing testing time. A long-awaited feature, Custom Roles, offers flexible permission configurations, while integration with the OpenFeature ecosystem and new alerting capabilities for Slack and Discord expand functionality. The JSON Feature Flag Editor is revamped to offer a more user-friendly experience, and updates to Next.js examples demonstrate new rendering strategies. Additionally, the release includes a new React Native SDK and improvements across multiple existing SDKs.