tileSprite memory problem

[i3Designer]

I'm creating a game, and I'm board using 3 backgrounds with three different movements:

create: function(){

        this.sfondo = game.add.tileSprite(0,h-270,w,162,'sfondo');

        this.testa = game.add.tileSprite(0,h-160,w,92,'prova');

        this.pavimento = game.add.tileSprite(0,h-68,w,68,'pavimento');

}

 

update: function(){

        this.testa.tilePosition.x -= 0.35;

        this.pavimento.tilePosition.x -= 1.5;

        this.sfondo.tilePosition.x -= 0.20;

}

 

If the computer game, the game is perfect, but on the mobile goes very slow.
The problem is the tileSprite, but I can not create a remedy, advice?