This document provides a methodology for estimating the performance of an Oracle Java Cloud Service (JCS) production system. It details test cases conducted on a sample Oracle ADF application deployed to different JCS compute shapes. The results show how request time, garbage collection time, thread usage, database connections, processor usage, and heap size are impacted when increasing load and scaling resources. The methodology recommends starting tests on a minimum compute shape and gradually scaling up the single node, or setting up a cluster, to support more load.