Ehh, last time I messed with canvas (sometime around February this year) any approach to clearing the entire canvas was too slow. In order to get any decent per

Ehh, last time I messed with canvas (sometime around February this year) any approach to clearing the entire canvas was too slow. In order to get any decent performance I had to layer multiple canvases on top of each other and keep the dimensions of the last draw operation saved so I'd only have to clear that bit of the canvas. The layering was so that I wouldn't have to bother redrawing things like the background after clearing something on top of it.