Optimizing GPU and CPU performance in mobile Unity 3D games involves smart asset management, efficient scripting, and optimised scene design. Reduce draw calls with batching and mesh combining, compress textures with mipmaps, and use mobile-friendly lighting and lightweight shaders. On the CPU, minimize heavy Update operations, implement object pooling, and leverage Unity’s Job System with the Burst Compiler. Use the Unity Profiler and Frame Debugger to pinpoint bottlenecks for smooth gameplay across devices.

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