When I was in my twenties I worked at one of the last U.S. jean factories. Not for very long, only about 6 months I think. But those professional machines really do sew that fast. We were paid a flat hourly, plus a little bonus for how many pieces you did per hour and it paid to work fast. My job was the side and inseams and I did quite a few per minute. I don't remember how many, it was so long ago, but that machine really raced. We actually had mechanics that roamed around and kept the machines working. It was really hard work and I did not enjoy it too much.
The machine in the second video doing the quilting is still a pro machine, not a home machine. It just looks like a home machine. It is still amazing how he is maneuvering that quilt through it.