![]() ![]() Cold start: App launched for the first time, after a reboot or update. ![]() On Android, the Google Play console warns you when a cold start takes longer than 5 seconds or a warm start longer than 2 seconds. ![]() On iOS, Apple recommends your app take at most 400ms to render the first frame. When a user taps on your app icon, it should start fast. These four metrics, as a core part of Sentry’s performance monitoring, gives you the details you need to not only prioritize critical performance issues but trace the issue down to the root cause to solve them faster. We believe there are four metrics every mobile team should track to better understand how their app is performing: Cold starts, warm starts, slow frames, and frozen frames. With Sentry for Mobile, you can now easily monitor your React Native, iOS, and Android app’s performance in real-time without additional setup (or accumulating a pile of testing devices). That means visibility into how fast your app starts, duration of HTTP requests, number of slow and frozen frames, how fast your views are loading, and more. To catch the most frustrating performance issues, you need to explore what’s happening on your users’ devices. However, testing an application before it ships is not enough. Most developers use profilers within IDEs like Android Studio or Xcode to hunt for bottlenecks and automated performance tests to catch performance regressions in their code during development. Unfortunately, seeing and solving performance issues can be a struggle and time-consuming. Slow apps frustrate users, which leads to bad reviews, or customers that swipe left to competition. ![]()
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