The HP Pavilion Notebook got taken over by a virus, so to have Internet, I had to get out the old Windows 98 desktop PC.
This computer is so slow, I had to fight to get a decent framerate in BZ. Between the 400MHz Intel Celeron processor, only 32 MB of RAM, and the ATI 3D Rage IIc AGP 4 MB Graphics card, you only begin to have a smooth game in SW mode with all textures turned OFF. I also reduced visibility to 100. My FPS is lower in window than it is fullscreen. I actually managed to reach 55 FPS in full screen, and by zooming in on terrain, I managed 60.7 FPS one time!

But remember, it looks like this:

and putting terrain detail to even "LOW RES" will cut framerate in half, getting 15-25 FPS full screen.