Unity

Big WebGL builds = slow first launch. Slow launch = fewer players. Many platforms also limit initial package size

Build size depends on:

• Unity runtime and generated code

• assets included in the build (textures, audio, shaders)

• compression (Gzip/Brotli)

• how content is delivered (e.g., Addressables)

This guide shows how to reduce the initial build without changing game logic.

Example (Fast 4G in browser DevTools)

• No optimization — full game in the initial download

• Addressables only — heavy assets loaded on demand

• Addressables + this guide — minimal initial package

Same game, different setup — much less data before the first interaction and faster startup.