I've personally run DOSCab on a P120 laptop. I've heard reports of it running on a P100. There are some options in DOSCab that can be disabled to increase performance on slower machines. Note that for a slower machine, the classic skins work best; I did get an occasional stutter when changing pages in album mode as it loaded the album art on the painfully slow laptop hard drive.
Ironically, DOSCab is easier to get running on older, slower machines because it's more likely to have a compatible sound card. Most new machines with integrated sound don't have hardware-SoundBlaster-compatible chipsets and/or DOS drivers.