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You should check your FF extensions. I had a very smooth experience on a much older setup: FF19, OS X 10.7.5, Core2Duo 2.9GHz (MaxBookPro late 2008), 4GB RAM.

I found that the HTML5 version tracked my mouse cursor more smoothly then Flash.

As long as your users have the same problem as goggles99, HTML5 will not be a technology to choose. It is more likely that they already have Flash installed, than being willing to "check their extensions".

BTW, HTML5 version runs really slow on my computer as well. FF1.9, Linux, Core2Duo 1.6GHz, 2GB RAM, while Flash one works flawlessly.

Your anecdotal experience says absolutely nothing about the progress of HTML5. Other folks with lesser setups aren't having the same issues as you (me included) so I suspect there is a problem with your rig.

It ran great for me in HTML5 (Firefox 19, Windows7 i7 Q720, 16GB RAM) + Firebug, et al open.

P.S. Firefox is complete garbage compared to Chrome.