If you have a child who seems to take forever to do something, wait until he or she wants to do something, like watch TV, play a computer game, visit a friend, play outside, etc.  Then say,

"You know, I've noticed you really like to pick up your clothes slowly, or get dressed slowly, or clean the kitchen slowly.  Before you do what you want, I made a bet with myself about how slow you can do something.  I'm going to give you a task to do and I want you to do it only in slow motion.  I'll time you and then see if you could move as slow as I think you can."  If you do it in less time than I think, you'll have it to do it as fast as you can next time. Do you think you can do it really slow?

Then, give the child a task to do that usually can be done in 5 minutes.  See if you can get your child to do it ten or fifteen minutes.