Especially in cases like this, where the 3D power is so woefully behind modern systems.
I emplore you to fly to Florida and play Quake II on my system and say it's not playable, or you'd be at a serious handicap against a PC. That's not the point though.
I really think you are missing the point here. Most people using classic Amigas aren't trying to beat modern PCs speed in 3D games. Why shouldn't a classic Amiga user get the most out of his box though? If it was all about benchmarks between PCs and Amigas, there wouldn't be a single classic user left in the world. Why do people restore classic/antique cars? Why do people customize classic/antique cars? They aren't as fast as modern cars, get much worse gas mileage, handles far worse and often it costs alot more to restore an old classic then it is to buy a new production car.
3D is done because it can be done, and it does give the possibilty to play some modernish games. With SDL and hopefully other ports, the possibilities grow even larger. I am looking forward to playing some original Duke 3D on this system, and I hope Hyperion realses some more ports in the future when OS4 is out. I will keep tweaking my system to ring out every ounce of performance possible:-)