the loading time depend on the slowest conection between your site and the visitor. For example for me this is probably somewhere between 14K/s and 32K/s between you and me,
That means that after 4-5 minutes of waiting was loaded, cached a chunk only, then when i start to watch, output from cache and continue to load, get the rest piece by piece. Autostart playing make things worst usualy.
I hope this will help,
best regards