When I was a kid I saw a quick change artist. I don't know who. But I remember part of the act. He had some costume, then went behind a curtain and then had something different. I thought it was a real skill. Like a really skilled person, that is able to pull off his clothing and then get dressed. Part of the illusion was the speed. BECAUSE HE WAS NOT FAST AT ALL. It took 8-9 seconds.
I really believed the skill, because it took longer than an instant. Now compare that with today's way of doing it. Now it is obvious that it is a trick. No real skill involved.