UPDATE: Read the thread down to find posts with best solution(s);   There is  a lot of discussions in this forum about scaling a Phaser Game. I found most of the game devs and examples using a high quality art/assets for games. For smaller devices the canvas is scaled down accordingly. This creates a doubtful question in our minds about the performance impact of overkilling small devices with hd graphics. Well I found the first step to improve that.   1. First of all decide the width and height