http://i.imgur.com/Gv339aQ.png
Wolfenstein 3-D
The screenshot itself is from a raycaster test I did a ways back - nice enough performance, but the original Wolf source code had a lot of assembly in it - something I know nothing of. But then, the other day - I noticed that they released the "source" to their javascript browser port (probably a while ago I guess, no HTML5 in sight). Now,
that is something I can work with.
Amusing thing is, their "draw" for that port, is all DoM based - easily replicable with Frames and Textures, with probably a lot better performance.