As i understand Lobby’s each lobby object create a query tread into the database. It is therefore very important that the queries are efficient, especially if the lobby is used by many users, many times a day.
To ensure that performance is ok, tests with data and evaluation with oracle explain plans is useful.
Insight knowledge in how that IAL’s is structured with tables and indexes can help a lot to ensure efficiency in joins. DBA can create additional assist with index discussion or adding.
Alternative could you use data mart functionality
/JE.