Customization of authorize_reply_query

Hello I use the FR just to only authenticate the user. The data are stored in Oracle DD. Is there any option how to disable authorize_reply_query? The reason is that that DB contains millions of records and each query take some some time. Depending on DB load is 0.5 seconds but during the peak it goes up 7 seconds. As the users are authenticated after authorize_check_query, the reply query is in my case only delaying the authentication. Maybe there is some option how to set some static response for the reply query? Thank you Vaclav