win32 client mapper bogs down during room creation

once the mudlet map file gets past a certain point, moving into unexplored territory becomes increasingly bogged down by the 4gb memory limitations of the 32-bit windows client because it's working out all 14 newly revealed gmcp.room.info data. not sure if there is another way of handling this on the script side, but it's become pretty painful.

i wonder if this might be related to #59 ... testing now