Consider that we got https://janhohenheim.itch.io/bike-game to run smoothly on Chrome at least, and that is a full 3D scene with lots of complicated geometry. With that in mind, I find it strange that you are running into performance issues. Maybe one of the underlying Bevy or Winit or wgpu APIs is somehow subtly broken on Wasm? I think the browser itself should definitely be performant enough for your use-case.