Given that the recipes of the Purple Blue and Cyan belts each make 20 at a time (presumably to balance them against the fact that the recipe takes speed modals.) It would make far more sense for them to also take 20 times as long to craft. (10 seconds base rather then the 0.5 seconds the recipes take at the moment) it seems a little silly that they can be crafted so fast. on top of that it makes it really hard to make a factory from them if you want no down time on assemblers as it currently requires over 12k iron plates a second to power just 1 assembler mark 3, rather then the ≈600 that one would expect it to take. (I didn't do the math on making the speed mods so that number is a bit low.)