Finally got around to watching .the.product. Well, the 215 second loading time should have been my first clue. I averaged about 2fps for the demo, with framerates as high as ~7fps and ~2spf. It took on average 5 seconds to switch scenes. The end credits were pretty much unreadable.
Back in my day, when you wrote a 64k demo, it did realtime textured phong shading on a 486/33. Bah.