MegaCool wroteVisp is good for browsing and basic internet usage, when it comes to Youtube you have to wait almost an hour to stream a low quality 3 minutes video, even if you have a 1mb connection, they probably have some sort of proxy that throttles youtube streaming, it happens with me im not sure about other visp subscribers, my solution was to download the video i want to view..
Did you try using proxies ?
I guess proxies would help in this case ?