Learn Unity Roadmap/Build & Deployment Build Optimization Topic 3 of 3 in Build & Deployment A default Unity build can be surprisingly large. An empty 3D project builds to ~80MB on PC and ~20MB on Android. With assets, it grows quickly. Build optimization reduces file size, load times, and build duration. More in Build & DeploymentBuild SettingsPlatform DifferencesBuild Optimization PreviousPlatform Differences All 157 topics in the Learn Unity Roadmap