Mobile app development build times are crucial to ensure productivity and efficiency in the development process. Slow builds can lead to wasted time, delayed releases, and a negative impact on developer productivity. To monitor and optimize slow mobile builds, developers can use Bitrise Insights to track build times, identify bottlenecks, and improve their workflow. By analyzing successful build time charts, exploring builds, and identifying bottlenecks, developers can reduce wait times, increase productivity, and streamline their development process.