I am, but that's besides the point, since I did compare it to Quake at 640x480 on an MMX 233, which is something I would not play btw, and said that the latter experience would arguably be finer, even taking into account that UAKM doesn't rely on twitch reflexes and can be very enjoyable even at lower framerates. So, that was some nice goalpost shifting on your side, I enjoyed it greatly. I have a feeling you are one of those "15-20 fps is fine" gamers.
Since I happen to have an unbelievable amount of time on my hands at the present time, I will take you up on this challenge and emulate a 486 by disabling caches on my K6-III+ and run my copy of UAKM on it. Who knows, I might even attempt Pandora Directive, one of my all time favorite games.
By the way, even on the Pentium III 500, Pandora Directive could not maintain 60fps at all times 😀 .