This contribution presents the evaluation results of external memory access concerning the group-off tests of ECM-18.0. The measurements were conducted using Valgrind, focusing on instruction reference (Ir) and LL cache data read misses (DLmr) across the entire decoding process in class B, C, and D of RA and class A, B, C, D, E and F of AI under CTC. This enables us to assess the complexity of each group-off test from the perspective of instructions and external memory access.