Will avoid drawing half pixel in HTML5 canvas improve speed?

I am drawing a s开发者_Go百科prite (of a ball) on a canvas element. As the ball moves however, the x or y position of the ball may become a fraction, eg. (20.153; 63.638). When canvas is used to draw this image, it attempts to use transparent pixels to make the ball appear in it's position more accurately.

I was wondering whether I should use Math.round() before drawing the ball to avoid the transparent pixel stuff, and possibly speeding up the game a lot. Will this help much? The game is a sorta complex pong game.

The image below should help with my explanation:

At least this guy seems to believe so. As Gabe mentioned, it depends on the implementation.

Note that some sort anti-aliasing seems to kick in if you are using regular coords (1, 14, etc.). For this reason some guides (Dive Into HTML5 mainly) seem to suggest that you are better off by rending using half pixels (ie. 1.5, 14.5, etc.). I don't know if this makes any difference to performance, though. It's noticeable on render result at least.

You might also want to experiment with various layering schemes. See this question for more information. Depending on your situation you might want to treat your objects as separate canvases even and just offset them on top of the background.

Alternatively you could try to render it all on one canvas. In this case you have some extra stuff to keep track of. This library seems to handle all the bookkeeping for you.