I'm really not sure why, exactly. But the resolution is awful and the game doesn't run fast; in fact it is worse on my Pentium D dual-core machine running 3 GHz than it is on the old Celeron single-core machine, vintage 1998, running at 500 MHz.
No, I don't understand why; I'm going to have to delve into the mysteries of the DOSBox .conf file to figure out if they've put some kind of "rev limiter" on the thing, but I doubt they have.
The other problem: the volume control for the music doesn't work right, so sometimes you get music whether you want it or not.
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Also, Ghost Story arrived with today's mail, so instead of playing Carmageddon I'll be reading. Well, that's probably better for me, anyway.