Agent skill
optimization
Optimization techniques for Nethercore WASM games. Covers WASM binary size reduction (LTO, wasm-opt), texture and mesh compression, audio optimization, and state size minimization. Use when a ROM exceeds size limits or when reducing build output size.
Install this agent skill to your Project
npx add-skill https://github.com/nethercore-systems/nethercore-ai-plugins/tree/main/nethercore/skills/optimization
Metadata
Additional technical details for this skill
- author
- nethercore-systems
- version
- 1.0.0
SKILL.md
Nethercore Optimization
WASM Optimization
Cargo.toml Settings
[profile.release]
lto = true # Link-time optimization
opt-level = "z" # Optimize for size
codegen-units = 1 # Better optimization
panic = "abort" # Smaller than unwind
strip = true # Strip symbols
Post-Build
wasm-opt -Oz game.wasm -o game.wasm
Typical savings: 20-40%
Texture Optimization
All textures use BC7 compression (4:1 ratio):
| Original | Compressed |
|---|---|
| 256x256 RGBA (256 KB) | 64 KB |
| 512x512 RGBA (1 MB) | 256 KB |
Resolution targets:
- UI elements: 256x256
- Characters: 256-512
- Environment: 128-256
Mesh Optimization
| Format | Size/Vertex |
|---|---|
| Position only | 12 bytes |
| Pos + UV | 20 bytes |
| Pos + UV + Normal | 32 bytes |
| Full | 40 bytes |
Poly targets:
- Background props: 50-200
- Interactive props: 100-500
- Characters: 500-2000
Audio Optimization
- Sample rate: 22050 Hz (engine limit)
- Channels: Mono only
- Use XM modules for music (95% savings vs WAV)
State Size Reduction
// Use compact types
struct Position { x: f32, y: f32 } // 8 bytes
struct Position { x: i16, y: i16 } // 4 bytes (fixed-point)
// Fixed arrays, not Vec
entities: [Entity; 64], // Known size
Quick Wins Checklist
- LTO and opt-level = "z" in Cargo.toml
- wasm-opt -Oz on final binary
- Texture resolutions at 256x256 default
- Music as XM format
- Fixed arrays instead of Vec
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