I couldn't resist :) this video is doom 2, 12mhz arm but running on a vga monitor (crt is faster), so I'm guessing the frame rate would be about this or a little faster on an 8mhz arm. https://youtu.be/jXo6BtmuZkc

An a3000 running Dread (https://youtu.be/vj-GVCcd4yo?si=X_R_f0TEnPHqOvVv) would be quite something!

What I'd love to see would be an Atari ST + T212 combo running doom (my electronics skills are not that good).

Also take a look at quake on the gba - 16mhz arm with cache. https://youtu.be/R43k-p9XdIk?si=yDycN7I3I4NWvEgU