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What about performance in different browsers? For SVG, everything is smooth in Chrome, but Firefox is pretty much slower (I'm using RaphaelJS)

I have checked on Firefox, Safari, Chrome. It is just as fast on each, takes about 2 secs to plot 25k+ points.

svg is slower on mobile browsers, and in android < 3.0 (i.e. ~96% of android devices), svg isn't supported at all

My recommendation is svg for static graphics/pictures, and canvas for animations/dynamic stuff, but keep the canvas as small as you can