GrowthBook 1.9 introduced a Proxy server to enable rapid feature rollouts for self-hosted instances, allowing changes in the GrowthBook UI to be propagated to users in under a second, a feature well-received by the self-hosted community. GrowthBook plans to extend this benefit to Pro and Enterprise accounts on GrowthBook Cloud, eliminating the need for users to manage their own Proxy servers. To ensure reliable, scalable, and instant feature flag deployment, GrowthBook Cloud utilizes a globally distributed CDN, short TTLs, and stale-while-revalidate headers, with Redis Pub/Sub and Server-Sent Events ensuring real-time responsiveness. This setup allows for features to be toggled and propagated quickly, maintaining uptime and speed. Currently, instant feature releases are supported for Javascript and React SDKs, with plans to expand support to other SDKs, inviting community contributions for further development.