Just because you like them speeded up doesn't mean that everyone wants to play them that way. He's just listing the standard framerates for these versions. You can also turn on autodetect which works quite well usually.
Well, if your Amd is a K6 or K6-2, your problem is the heavy use of math calculations that the emulator does. It runs on that CPUs but sometimes, especially when there's a lot of fog, the cpu can't keep up with the emu and heavy slowdowns occur. You can disable Software Advanced Blending, as I know vodoo 3 doesn't do that in hardware. But be warned you'll miss some special lighting effects