User Summary paging not working

I have a external user database of over 50,000 records. The user_summary.jsp module loads ALL records in the first page and does not honor

the paging settings (25 per page). The values show up in that it computes the total number of records, the total number of pages which should be

displayed, the setting says 25 records per page, but however - all 50,000+ records are shown on the first page.

Any ideas ?