Your app’s launch time is crucial, with over 60% of mobile app users expecting it to launch in four seconds or less. A slow launch can negatively impact user expectations and overall quality perception. To monitor and optimize your app's launch time, consider reducing the size of resources and assets, using efficient image formats like SVG, and configuring Android's Gradle to shrink unused resources. Additionally, consider using the Android App Bundle (AAB) format to export and distribute your app, which can result in smaller APK files for users to download. Network performance is also critical, with long load times and poor responsiveness being top frustrations faced by users. To improve network performance, avoid loading high volumes of data in splash screens, sync data in the background, cache frequently-needed data, provide visual feedback, and monitor and optimize your network requests. Memory use is another critical aspect, with memory leaks and Out Of Memory (OOM) errors being common issues to be aware of. By following these best practices, you can improve your app's performance, stability, and overall user experience.