VR Game Distribution Package Size Optimization
Meta Horizon Store and Steam have size limits and recommendations, but the main reason to optimize distribution—user experience. 4 GB game versus 1.2 GB at identical visual quality—20 minutes waiting difference on standard home internet. For Quest standalone where users aren't used to long mobile download waits, this directly loses installations.
Where bloated package size lives
In most VR projects, 70–80% of package size is textures. Typical audit picture: project has 2 GB textures, of which 600 MB are uncompressed or weakly compressed PNG/PSD files imported directly without Texture Compression settings.
Quest 2/3 is ARM chip with Adreno GPU, native compression format—ASTC. 2048×2048 texture in RGBA32 takes 16 MB. Same texture in ASTC 6×6—1.5 MB, in ASTC 8×8—0.9 MB. 17x difference with negligible quality loss for diffuse maps.
Configuration in Unity: Platform-specific overrides in Texture Import Settings → Android → Format: ASTC 6×6 (for diffuse and roughness maps), ASTC 4×4 (for normals where quality is critical). Standard Texture Compression in Project Settings isn't enough—need explicit per-texture setup or Texture Compression Groups via Addressables.
Second major source—audio. Unity by default imports audio without aggressive compression. Background tracks in WAV at 50–100 MB each not uncommon. Configuration: Load Type Streaming, Compression Format Vorbis, Quality 70–80% for background music. Short sound effects—Decompress on Load with Vorbis. Total audio reduction can be 30–60%.
Build size analysis tools
Unity Build Report first step. Window → Open Last Build Report shows what weighs how much in final package. Sorting by size immediately reveals anomalies: textures somehow taking 20 MB instead of expected 2 MB.
Asset Bundle Analyzer (open source from Unity Technologies)—for Addressables projects. Shows asset duplication across bundles: one texture included in three different bundles takes space thrice.
Scanning via AssetDatabase.GetAllAssetPaths() with custom audit script: finds textures without ASTC override, audio files without streaming, meshes with excess vertices for their LOD level.
Addressables and deferred loading
For VR games with multiple levels—mandatory split into base package (code + first level) and remote assets (other levels via CDN). Unity Addressables with Remote Load Path on Cloudflare R2 or AWS S3. User installs 400 MB, launches game and sees first level immediately. Rest loads in background.
Meta Horizon Store supports base APK + expansion files division. Base APK must be under 4 GB (Android APK format limit), expansion up to 4 GB each. In practice—keep base APK under 1 GB for fast first content load.
Shader stripping—separate saving point. Unity includes shaders for all possible keyword combinations. In VR project with URP after Shader Stripping setup in Graphics Settings (enable Strip Unused Shader Variants), size often reduces 50–150 MB just from removing unused shader variants.
| Optimization type | Typical size reduction |
|---|---|
| ASTC texture compression | 40–70% of texture volume |
| Audio optimization (Vorbis + Streaming) | 30–60% of audio volume |
| Shader stripping | 50–200 MB |
| Addressables + remote assets | 50–80% of base package |
Work timeline: audit and basic optimization—2–5 business days. Full restructuring with Addressables transition—2–4 weeks depending on project size.
Cost is determined individually after analyzing current build state.