Unity Mobile Optimization

Overview

Mobile platform optimization for Unity focusing on iOS and Android performance, battery life, and deployment.

Foundation Required: unity-csharp-fundamentals (TryGetComponent, FindAnyObjectByType, null-safe coding)

Core Topics:

• IL2CPP compilation and optimization
• Memory management and profiling
• Touch input and mobile UI
• Battery life optimization
• App size reduction
• Platform-specific code

Quick Start

// Platform-specific code
#if UNITY_IOS
    // iOS-specific code
    Application.targetFrameRate = 60;
#elif UNITY_ANDROID
    // Android-specific code
    Application.targetFrameRate = 30;
#endif

// Touch input
if (Input.touchCount > 0)
{
    Touch touch = Input.GetTouch(0);
    if (touch.phase == TouchPhase.Began)
    {
        HandleTouch(touch.position);
    }
}

Platform Constraints

• iOS: Metal rendering, App Store guidelines, 150MB initial download
• Android: Vulkan/OpenGL ES, API level fragmentation, 150MB initial
• Memory: 1-2GB low-end, 4-6GB high-end
• Thermal: Throttling after 5-10 minutes

Optimization Checklist

• ✅ Texture compression: ASTC (mobile), ETC2 (Android), PVRTC (iOS)
• ✅ Audio compression: AAC (iOS), Vorbis (Android)
• ✅ Reduce draw calls: <100 mobile, batching
• ✅ IL2CPP optimization: Strip engine code, managed stripping
• ✅ Battery: Lower target framerate, reduce update frequency

Best Practices

1. Profile on device: Not just Unity Editor
2. Minimize allocations: Reduce GC pressure
3. Touch-friendly UI: 44pt minimum touch target
4. Handle pause: OnApplicationPause lifecycle
5. Test on low-end: Target lowest common denominator