So post some Frames per second benchmarks of Doom running on your machine, and what hardware the machine is using 
I'll start it out:
Using Doomattack, with screen size two steps below max.
High detail 10-12 FPS
Low detail 18-20.
They both fluctuated a fair bit of course, but those are pretty average.
This is on my ACA 030/56 from Individual Computers, and plain old AGA.
Man does that bring back some memories! 1998. I use to play and tweak ADoom and Doom Attack like there was no tomorrow. Had a A4000 with A3640 and was not getting good frame rates, but was around 10fps full screen 320x240. Then I got a CSMK II 060 at 66MHz and it rocked! Was getting like max FPS 35. That was NICE...