Anton Ertl and David Gregg cracked this nut a long time ago with gForth / vmgen! It's only when you add registers to their basic two-stack model, like Parrot do

Anton Ertl and David Gregg cracked this nut a long time ago with gForth / vmgen! It's only when you add registers to their basic two-stack model, like Parrot does, that you gain any more speed.