If you're looking to save time why you're doing your machine piecing consider chain-piecing like-size units together. For example I've got sets of squares here I want to sew together and I'm going to piece them without lifting the a presser foot between pairs. So I've matched them up on my table here. And I can just grab the next set and continues sewing. I don't have to stop to snip the threads. I can just continue on. And when I end up with is a nice long chain of pieces that are still attached to one another. It's a great way to save time while you sew.