Explore the intricacies of implementing Unity's Entity Component System (ECS) for mobile game development through a detailed examination of the Metropolis Traffic Simulation project. Dive into the challenges of creating complex game mechanics using a data-oriented approach, focusing on pathfinding, collision detection, and other essential elements. Learn best practices and common pitfalls when utilizing the C# Job System, and discover how to achieve both scale and complexity in mobile game development. Gain insights into parallel programming techniques, memory management, and optimizing performance for large-scale simulations. Through practical examples and in-depth explanations, master the art of leveraging Unity ECS to create high-performance, massive-scale game worlds on mobile platforms.