I started it at 9pm Saturday night, used insomniac to close the lid and let it download all night and the frigging progress bar hasn't even moved 12 hours later at 9 am. called apple and even talking to a senior ML guy the best he could tell me was to take it to the genius bar or somewhere else and try to get it faster. and i have a great and fast home network. i stream netflix and Apple TV video with no stutters yards away from my router. oh, and he says why don't i just ethernet it to the router -- and this after i told him i had a 2012 macbook air, which of course has NO ethernet port. he said well it could take days for it to download. the only reason i want it is for streaming. it just might be easier to buy that $10 app that streams and screw ML.