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That's a very old video. Here's one I made:
[ Show youtube player ]
The biggest performance improvement in Catacomb 3D came from drawing the walls using 68k compiled scalers. They are basically large unrolled loops that spit out textured columns to the screen without calculating anything real-time. The original game used them for the sprites too, but it was self-modifying code which is a big no-no on 020+ with the cache enabled.
Anyway, walls can be drawn at near copy-speed using this method, which would help Wolf3D too, I guess. I could give it a shot if I had the source of the latest version.
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