As I remember playing 'Lemmings 2' (long time ago, maybe I am wrong) from DOS, it was 'normal'. Anyway, PC DOSBox version is faster then any other version. As I said, SNES NTSC cartridge, also runs faster then PAL cartridge (talking about using ROM image on the emulator).
Does it really matter where is the source of the problem? Slowing down and speeding up, works fine with MAME, why there isn't (or there is? that's what I asking here) a way to do the same thing proper with DOSBox? My goal is not to find excuse for the improper work of that game. I am trying to make it work as it should, but I am not very succesful (obviously) in this, so I asking for the help of you guys. Solution doesn't need to be related with screen refresh. In fact, I will be happy with any solution (if there is any).
About other games in DOSBox, I don't know. DOSBox is far from perfect, I can't tell is the speed right in 'Doom'. Maybe it is, maybe it isn't. And for example, 15% faster game play can hardly be a problem in 'Monkey island' or 'Legend of Kyrandia'.