It takes like 5 seconds to assign a 1000x1000 pixel texture to a SpriteSheetBundle in the Bevy game engine

Question

Is there a way of improving this situation or am i just using the engine wrong? I tried to go around this problem by first creating and spawning Images of the Background with lower Quality.

fn spawn_background(commands: &mut Commands, texture: Res<Textures>) {
    commands
        .spawn(SpriteSheetBundle {
            texture_atlas: texture.background_low_texture.clone(),
            transform: Transform::from_scale(Vec3::splat(10.0)),
            ..Default::default()
        })
        .with(Dummy)
        .with(Background);

    commands
        .spawn(SpriteSheetBundle {
            texture_atlas: texture.background_med_texture.clone(),
            transform: Transform::from_scale(Vec3::splat(10.0)),
            ..Default::default()
        })
        .with(Dummy)
        .with(Background);

    commands
        .spawn(SpriteSheetBundle {
            texture_atlas: texture.background_texture.clone(),
            transform: Transform::from_scale(Vec3::splat(10.0)),
            ..Default::default()
        })
        .with(Background);
}

I am loading the Texture to the "Textures" Resource like this

fn setup(
    commands: &mut Commands, 
    asset_server: Res<AssetServer>,
    mut texture_atlases: ResMut<Assets<TextureAtlas>>,
) {

    let background_texture_handle = asset_server.load("textures/background.png");
    let background_texture_atlas = TextureAtlas::from_grid(background_texture_handle, Vec2::new(1000.0, 1000.0), 1, 1);

    let background_low_texture_handle = asset_server.load("textures/background_low.png");
    let background_low_texture_atlas = TextureAtlas::from_grid(background_low_texture_handle, Vec2::new(1000.0, 1000.0), 1, 1);

    let background_med_texture_handle = asset_server.load("textures/background_med.png");
    let background_med_texture_atlas = TextureAtlas::from_grid(background_med_texture_handle, Vec2::new(1000.0, 1000.0), 1, 1);

    commands.insert_resource(Textures {
        background_texture: texture_atlases.add(background_texture_atlas),
        background_low_texture: texture_atlases.add(background_low_texture_atlas),
        background_med_texture: texture_atlases.add(background_med_texture_atlas),
    });
}

Answer 1

When compiling with the --release command line option, it runs much faster as the release profile have optimization enabled.

See cargo documentation