How can we avoid ifw loading product information in memory for non-usage accounts

Hi All,
Is there a way to avoid loading into memory all the service/purchase_product/etc information for few accounts every time the ifw starts as these accounts, will only have purchase and cycle fees, i.e. there would be no usage processing for them in BRM at all.

As it would be an unnecessary use of the ifw memory, and could eventually impact the performance of the rating of the remaining accounts.

Thanks
Stuti