After all this work on bringing canvas up to a decent speed I am thinking about a new mini-library or shiv if you will for drop in performance in canvas.

Some of the optimizations that it could do:

• Draw an image onto temp. canvas then temp canvas onto main canvas
• Use putImageData when possible
• requestAnimationFrame for draw updates
• Implement redraw regions

The last one may be tricky as the way they are implemented in Crafty is with a spatial hash map of all the entities and setters on the properties that render regions dirty therefore need redrawing.

Once it’s bulletproof in Crafty I shall look into it.