Global smartphone use is at an all-time high, with an estimated 6.8 billion people using smartphones, and consumers now have higher expectations for performance standards in apps. Heavy app usage has raised the bar for stability, speed, and overall user experience. Performance monitoring tools have made it easier for developers to improve their app's stability, while also tracking metrics such as launch time, screen loading time, network performance, UI responsiveness, and user terminations. With more apps available, users can simply switch to a competitor if an app performs poorly, making it essential for developers to monitor these metrics closely. The Apdex score is a comprehensive metric that represents multiple performance metrics, providing a guiding star for gauging quality and maintaining high levels of mobile app performance.