it runs 100% with a little to spare on a athlon xp 2200 i have, 768 ram SDRAM it would be faster with ddr1 (by about 5-15%)
i was using fastmame 0.98
fast mame is great about 10-20% faster then regular mame32
i just recently discovered it but i dont think it's being updated anymore past 0.98 and it's site is messed up.. now just has a review of some neogeo game no down load links

the first version of mame to support KI 1 & 2 was 0.63.. although it was hard finding a CHD for it (v1.0)
EDIT: actually i went back and double checked, there seems to be a problem with fastmame 0.98, it does'nt want to save dip switches or buttons.
the next oldest release i have for fastmame is 0.84, and it works fine so you might try that.