Saying that its always going to be fast is inaccurate. It all depends on the size of the roaming profiles. Sure, for schools and corporate networks you’re going to have a limited profile size to work with (our corporate network has a 100MB profile limit) it’s going to take no more than a minute to download that from scratch, even on a 10Mb network connection… When you’re at home, this is going to be totally different, as most home users (the ones that don’t know about profile size) will save files directly to the profile. Game saves and other program information will be saved in the profile, and on last check, my home profile on XP was in excess of 700MB. On a slow network, that’s going to take lots of time, especially if there are hundreds of users logging in at a similar time.