The reason the BR loads so slowly is that it is trying to access the live features obtained from the internet. To bypass this, go the the BR menu in the PS3 dash and turn the BR internet connectivity from "allow" to "confirm." This way when a disc wants to access web features, it will ask you for confirmation, in the case of Ironman, you want to say no. I think the main issue was that there was server overlaod last night, so if you try again sometime today at non-peak times, the live features should hopefully load much faster.
Mine loaded in about 10 seconds last night and it accesses the net for the web features.