Godot 4.5 adds WASM SIMD by default

Godot 4.5 was released on September 18, 2025, with WebAssembly SIMD enabled by default for web exports.

Key web export improvements

• WASM SIMD by default: Single Instruction Multiple Data operations improve performance without manual configuration
• Single-threaded export remains default: Avoids Cross-Origin Isolation header requirements
• PWA support improved: Service worker fallback for COOP/COEP headers

PWA features

• High-resolution icons
• Display orientation settings
• Offline support via service worker caching
• Custom offline page option

Continued limitations

• C# not supported for web export (use GDScript or Godot 3.x for C#)
• Audio restrictions in browsers (user interaction required)
• Full-screen must be triggered by user input

References

• https://godotengine.org/releases/4.5/
• https://docs.godotengine.org/en/4.5/tutorials/export/exporting_for_web.html