Unity Optimize Web

When to use

Improve a selected Unity project's web-player startup, delivery size, memory or runtime performance. This skill retains Unity as the engine; it does not replace the game with a browser-engine implementation.

Activation and inputs

Run commands/resolve-engine.sh and commands/resolve-skill.sh unity-optimize-web; require effective UNITY compatibility before edits, builds or browser launches. Honor permitted output scope. Inspect actual Editor version, web build module, selected packages, build configuration, hosting control and supported browser/device matrix. Keep observations and reports in the resolved .hephaera/.cache/.

Workflow

1. Establish comparable development and release baselines with source/package identities, scenes, stripping settings, compression, cache state and representative devices. Set project budgets for transferred bytes, first interaction, steady/peak memory and frame-time percentiles.
2. Use BuildReport and browser network traces to attribute cost before changes. Separate download bytes, decompressed files, WebAssembly memory, browser resources and Unity allocations; a smaller file does not prove lower peak runtime memory.
3. Remove measured unused content through owned scene/asset and stripping decisions. Verify reflection, serialization, fonts, variants and dynamically loaded content survive release stripping. Do not enable aggressive stripping without runtime coverage.
4. Match build compression to server Content-Encoding, MIME and cache behavior. Test an actual HTTP-served player, cold/warm loads, content-hash upgrades and cache invalidation. Use a decompression fallback only as an explicit hosting tradeoff.
5. Bound initial content and concurrent downloads/decode work. Review texture/audio import, allocation hot paths and memory growth on target browsers. Gate threading and platform features against the installed Editor and deployment isolation requirements.
6. Validate focus, resizing, pointer lock/fullscreen, input, user-gesture audio, lost context, suspension and offline/error UI in real browsers. Browser evidence covers this web player; native player UI/audio still requires native testing.

Read web build measurement and delivery for report scope, compression and acceptance evidence.

Output and verification

Deliver measured before/after builds, the change attribution, HTTP/browser evidence and remaining budgets/limitations. Keep build output outside runtime source assets and do not deploy or publish automatically. Missing platform modules, host control or representative devices block the affected claims; an Editor build receipt does not certify startup or browser gameplay.