Hi, To satisfy an Audit requirement Iíve recently implemented object level security on a large AS/400 model 830 (V5R1). That is to say every production object is secured by an authority list. The contents of the authority list contain Group Profiles with private authorities. The number of authority lookups have increased dramatically and have had a performance impact on the system. The authority lookup process is well understood by us. We know this method causes pretty much the maximum amount of lookups. We understand the many lookups cause CPU to be used. What we do not understand is a means of quantifying the impact. The component report of the performance tools give us a count of the authority lookups. The performance advisor gives a glib statement to the effect of the maximum CPU used due to the authority lookups may have been as high as X%. Questions: 1) Does anyone know a way of estimating the Number of Authority Lookups versus amount of CPU used? Eg 10 000 lookups persecond is roughly equivalent to 5% CPU. Estimates for these figures were provided in one of the redbooks back in the CISC days. But I canít find a modern equivalent. 2) The performance tools manual describes the RISC implemented ĎAuthorisation Lookup Cacheí. It says that it can store up to 32 private authorities for objects and authorisation lists. Does this means 32 private authorities for every object or does it mean a total of 32 combinations of object and private authority to it? 3) If a lookup is satisfied by what it finds in the ĎAuthorisation Lookup Cacheí does this still signal an authority lookup exception as reported in the Component Report. I assume it does because the Performance manual states that even those lookups satisfied in the cache will be reported. It would be good to know for sure. I canít believe we are the first people to ask these questions so Iím hoping someone out there has been through this exercise.