no doubt is slowness, you have no idea how stressful stay more than 30 minutes waiting for a confirmation. Another day I sent bitcoin to someone and I stayed more than 30 minutes waiting for a confirmation at least. can not sleep until I had a confirmation, imagine if I was a super market in my country for example, I would already be in trouble. bitcoin needs to be faster, sometimes the person needs money urgently and this slowness does not help. the big thing is the profits.