Try running it in a sped-up emulator? I can't provide the option in the browser-embedded version, and it's slower than a desktop emulator in the first place.
I ran it on dosbox and still the stopping for several seconds every couple of steps was annoying. I think that's what kinda kills it most. I wanted to like it but it was just too slow : /
Oh, all right. Unfortunately the DOS build can't be sped up. Sorry about that.