Geoff i havent noticed a difference in clarity and speed but as i said in the other post you can increase layer height. The higher the clearer. Also if you have a larger nozzle avail that will give you clearer prints as well. I know some guys that print clear stuff with a .5 nozzle at .3-.45 layer heights and the print dont look nearly as white as mine. The more squished your lines are the more cloudy. Temps will affect this as clarity as well. You want the lowest you can while still getting good layer adhesion. All this will apply to pet and any clear type filament