What one of the more experienced Akidoka at my dojo said (he's got 10+ years)
Many people use speed to make up for bad technique. If you want to know if you're doing the technique correctly, move real slow.
same thing in any physical activity. You start slow riding a bike, pitching a ball, ice skating, whatever..and once you've done it enough times to have it programed in so you dont have to think about it you build speed. Then when you move rapidly you also move CORRECTLY
hate to argue with the originaly quoted author but he's dead wrong.