Zedia, a Brazilian startup focusing on delivering targeted ads via TV signals, significantly improved its ad delivery system's cost-efficiency and performance by switching from Redis to Dragonfly, a high-performance, Redis-compatible in-memory data store. The transition was driven by Redis's inability to handle the high volume of connections and requests without crashing, leading to increased operational complexity and costs, especially with the Brazilian currency devalued against the US dollar. Dragonfly provided Zedia with seamless Redis compatibility, allowing them to adopt it without code changes, and its ability to manage millions of requests per second reduced the need for horizontal scaling, thus lowering AWS bills. Despite the occasional challenges posed by AWS spot instances, Zedia implemented cloud storage-based snapshots and optimized their deployment strategy, ensuring reliable recovery and further cost reductions. This transition has allowed Zedia to maintain high performance and reliability at a lower cost, with plans to explore additional platforms like GCP to optimize further as they scale.