Back to course

Optimizing Wasm Binary Size

Flutter 2026: The Impeller & Wasm Masterclass

Reducing the Wasm Footprint

When deploying to the web, size is speed.

Optimization Techniques

  1. Dead Code Elimination: Dart 4's compiler is aggressive. Don't import libraries you don't use.
  2. Deferred Loading: Use import ... deferred as ... to break your Wasm binary into smaller chunks.
  3. Compression: Ensure your server serves .wasm.br (Brotli) files.

Goal: Keep your initial load under 1.5MB for a full-scale app.