Ok, after about 45 minutes of finding bioses, configuring the emulator, reading tutorials... basically figuring out HOW to make DEMUL work (lol), I got Crazy Taxi up and running. This was on my Core i5 3.4 ghz, 8GB RAM, Windows 8, GTX 460 GPU box.
The game constantly stutters. It'll be smooth, then "stop". Performance monitor showed it wasn't memory, cpu, or disk issues. I think its sound emulation.
I had it in DX11 mode.
Its the same problem I have with PS2 emulators - when they get "choppy" or "stutter" - its usually sound emulation related.
I only tried the Dreamcast version of Crazy Taxi. I guess I could track down the Naomi version too.
(NullDC won't even load on Windows 8... instantly crashes. so at least DEMUL is ahead in that department)