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Scale a container with RenderTexture on every frame


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Hi, I don't like to bother, but I don't sure what I'm doing and I need some guidance if it's possible...

I have two containers, one for map sprites (320x180px) and the other for UI graphics (who it's resized to native resolution, in my case 1920x1080)

My intention is to rescale map_sprites_containter and all its sprites to 1920x1080 in the most efficient way, every frame. So I came up with the idea of render a texture of map_sprites_container, convert it to a sprite and scale it. 

Is this the best way?

Some pseudo code:
var bitmap = new Bitmap(320, 180);
var renderTexture = PIXI.RenderTexture.create(320, 180);
renderer.render(map_sprites_containter, renderTexture);

var canvas = renderer.extract.canvas(renderTexture);
bitmap.context.drawImage(canvas, 0, 0);
canvas.width = 0;
canvas.height = 0;
renderTexture.destroy({ destroyBase: true });

var render_map_sprites = new Sprite();
render_map_sprites.bitmap = bitmap;
render_map_sprites.scale.x = 6
render_map_sprites.scale.y = 6

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