With more that seven million apps available across iOS and Android stores, it is difficult to get downloads, but even harder to retain users. Performance of an app plays a key role in retaining users and developers can analyze & improve it by harnessing the power of the various performance and debugging tools that comes pre-packaged with Flutter, collectively known as DevTools. In this talk, we will take a practical deep dive into the various tools (CPU Profiler, Performance, Memory, App Size, Network, Logging) available in the DevTools suite via real world app code-labs (like Wonderous App). And, we will learn how these tools can help you collect, monitor and analyze various metrics that can help you build high performance apps.