Yeah, they do return before rendering is done. For example, this fiddle[1] inserts 100k svg circles; it takes 1000 milliseconds on my machine, but scrolling aro

Yeah, they do return before rendering is done. For example, this fiddle[1] inserts 100k svg circles; it takes 1000 milliseconds on my machine, but scrolling around takes several seconds. [1] http://jsfiddle.net/vHvZD/ http://jsfiddle.net/vHvZD/