This is true, i had a comment about this since day1.
I dont know why, but these rooms were created by broadsword in a different technique on EC.
The major problem is that the elements of the map start downloading as u start browsing the map; The best example is belfry, when ur whole screen freezes as thing as the boss starts pushing u away. U can also notice network performance massive jumps if you have a slow internet connection.
Im entirely sure that this is a caching memory problem, and i dislike how these dungeons load on EC, and very curious about why they changed the construction strategy...
@Kyronix @Bleak