Amiga:
Cyberstorm PPC 604e 150 MHz (yes, only 150, i have a lowend 604e Board...)
Cybervision/PPC
OS: AmigaOS 3.0 (3.5 is ordered, but not yet arrived)+ WarpOS V4

PC:
Pentium II 300 MHz
Riva TNT (TNT 1) Based AGP-Bus Graphics Board
OS: Windows 95

Remember: All speed is done with SOFTWARE RENDERER, for both systems, for
fairness :)

The values (i tested at different places, but of course PC and Amiga version
were always tested at the same place):

Level                               Amiga Speed (150 MHz)   PC Speed(300 MHz)
dmandoria                                 31 fps               60 fps
oglemine1                                 35 fps               72 fps
oglemine1 different location with         24 fps               45 fps
lots of monsters visible hive1             9 fps               27 fps
(lot of transparency FX)          
no typical situation for the game

And now some values in a higher resolution:

Startlevel in 400x300                     24 fps               41 fps
Startlevel in 640x480                     10 fps               19 fps

What do we learn of this ?

1. On an average the Amiga Version has the same speed like the PC version
   (at least if we had a PC with the same MHz-number, 31*2 = 62 fps
   for example, where the PC version had 60 fps, the Amiga Version 31 fps
   (first example)
2. Massive Transparency Effects are the death for every software-renderer,
   no matter if Amiga or PC. Luckily these effects are not displayed
   all the time. Situations like at the start of hive1 only happen in very
   few situations (hive1 is actually the slowest level in the whole game,
   it seems, at least at a certain position in the level)
3. The speed value of Heretic II is actually quite nice, even on a lowend
   PPC like mine, on a 233 MHz you will have values around 233/150 times
   as fast.
4. We can expect much more from 3D Hardware (Warp3D Support) (On PC there
   was a REALLY HUGE speedup for 3D Hardware, especially when Transparency
   was involved)
5. PCI/AGP did not give that much more speed than PowerUP-Bus/Zorro 3 (i did
   not do actual speedtests of Z3, but it is not that much slower than on
   Zorro 3. Also WB Window Mode is also not that much slower - though of
   course slower)

I was also told by Hyperion that they are currently making much progress for
the 68k version, and that it looks good that probably 060+software renderer
will be fast enough to get the game playable.