https://userapps.support.sap.com/sap/support/knowledge/en/3672572
3672572 - Fluctuating performance of statements related to ADR* tables: ADRCOMC, ADRT, ADRU, ADR2,...
You face performance degradation or fluctuation when running statements using ADR* tables. Example statement: SELECT /* FDA READ */ "CLIENT" , "ADDRNUMBER" ,...