The download isn't the problem, its the time it takes your computer to process the information from the download. You can download the blockchain from a torrent file, and have it pretty quick. Your computer has to process all that info still.....and it can take over a day. a lot of the time.
Ouch, 20gb of processing, you need to have some killer pc for that to be done quickly
It not like processing a movie, or a picture. The cpu has to process the numbers, and it takes a long long time. Try it, before you get all sarcastic.