acdc - Every level has two elevators to the levels above and below it. The levels around the shaft have the added dynamic of the shaft itself, which can be jumped up or down. So I'm not sure what you mean by only one elevator to the base area... As for frame rates, yeah, it can run a little slow in the shaft, but I blame engine limitations on trying to draw such a large structure. I worked with what I have.
40 is better than I was getting on my machine, and is playable enough for me, usually! I did think I crusher-ified the elevators, and on the elevators with open shafts I put clip brushes around so you can't block their ascent. Other elevators are pretty well enclosed. If more people level that complaint at me I might begrudgingly release a 1.1, but I highly doubt that.